Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Desktop will not boot when I have new Power Supply

04 Mar 2012   #1

Windows 7 Pro 32
Desktop will not boot when I have new Power Supply

Okay when I installed new power supply and it was working fine. I came back home and installed new rams and when I turn it back on, the computer will no longer turn on and so I took out the new rams and installed the old one back on and still will not turn on. I removed the old power supply and left the old ram on the motherboard and still will not turn on, not even the fans...

Motherboard has a green steady light, same with the power supply on the old one.

Gateway GT5014 Pentium D 2.8 GHz upgrade from Media Center 2005 to Windows 7 ULT

My System SpecsSystem Spec
04 Mar 2012   #2

Windows 8 64 bit PRO

Please update your System Specs
System Info - See Your System Specs
I am mainly interesting in knowing which motherboard you have.

Your post is confusing,
So you have used the NEW power supply, it worked before you changed the RAM.
Now your computer will not boot or turn on? With the new AND old ram?

Later you removed your old power supply ....? When was it in?
Have you tested the new and the old ram with your old power supply?

Please post back with the 2 power supplies you have also
My System SpecsSystem Spec
04 Mar 2012   #3

Windows 7 Pro 32

Gateway GT5014 Media Center (Pentium D 2.8 GHz, 1 GB RAM, 250 GB HDD) specifications

  • General
  • Type Media center
  • Product Form Factor Tower
  • Built-in Devices TV tuner
  • Width 7.3 in
  • Depth 17.9 in
  • Height 15.4 in
  • Weight 23.4 lbs
  • Processor
  • Type Intel Pentium D 820 / 2.8 GHz
  • Multi-Core Technology Dual-Core
  • 64-bit Computing Yes
  • Installed Qty 1.0
  • Max Supported Qty 1.0
  • Processor Main Features Intel Execute Disable Bit , Intel Extended Memory 64 Technology
  • Mainboard
  • Chipset type Intel 945G Express
  • Data bus speed 800.0 MHz
  • Cache Memory
  • Type L2 cache
  • Installed Size 2.0 MB
  • Cache Per Processor 2 MB ( 2 x 1 MB )
  • RAM
  • Installed Size 1.0 GB / 4.0 GB (max)
  • Technology DDR2 SDRAM
  • Memory Speed 533.0 MHz
  • Memory Specification Compliance PC2-4200
  • Form Factor DIMM 240-pin
  • Features Dual channel memory architecture
  • Configuration Features 2 x 512 MB
  • Storage Controller
  • Type 1.0 x Serial ATA - Integrated
  • Controller Interface Type Serial ATA-300
  • Channel Qty 4.0
  • Storage Controller (2nd)
  • Type 1 x IDE - Integrated
  • Controller Interface Type ATA-100
  • Channel Qty 1
  • Storage
  • Hard Drive 1.0 x 250.0 GB - Standard - Serial ATA-150 - 7200.0 rpm
  • Hard Drive (2nd) None
  • Optical Storage
  • Type DVD±RW (+R DL) - IDE
  • Read Speed 40x (CD) / 16x (DVD)
  • Write Speed 40x (CD) / 16x (DVD±R) / 4x (DVD+R DL)
  • Rewrite Speed 24x (CD) / 6x (DVD-RW) / 8x (DVD+RW)
  • Optical Storage (2nd)
  • Type DVD-ROM
  • Read Speed 48x (CD) / 16x (DVD)
  • Storage Removable
  • Type None
  • Monitor
  • Monitor Type none.
  • Graphics Controller
  • Type Integrated
  • Graphics Processor / Vendor Intel GMA 950 Dynamic Video Memory Technology 3.0
  • Audio Output
  • Type Sound card - Integrated
  • Sound Output Mode 7.1 channel surround
  • Compliant Standards High Definition Audio
  • Speaker(s) 2.0 x Right / left channel
  • Input Device
  • Type Mouse , Keyboard
  • Mouse
  • Mouse technology Optical
  • Mouse interface USB
  • Mouse features Scroll
  • Telecom
  • Modem Fax / modem
  • Max Transfer Rate 56.0 Kbps
  • Protocols & Specifications ITU V.92
  • Networking
  • Networking Network adapter - Integrated
  • Data Link Protocol Gigabit Ethernet , Ethernet , Fast Ethernet
  • Printer
  • Type None
  • Expansion / Connectivity
  • Expansion Bays 2.0 (total) / 1.0 (free) x Front accessible - 5.25" x 1/2H , 2.0 (total) / 2.0 (free) x Front accessible - 3.5" x 1/3H , 3.0 (total) / 1.0 (free) x Internal - 3.5" x 1/3H
  • Expansion Slot(s) 1.0 (total) / 1.0 (free) x SD Memory Card - DIMM 240-pin , 1.0 (total) / 1.0 (free) x Memory Stick , 4.0 (total) / 0.0 (free) x Memory , 1.0 (total) / 1.0 (free) x CompactFlash Card , 3.0 (total) / 1.0 (free) x SmartMedia Card , 1.0 (total) / 2.0 (free) x Processor , 1.0 (total) / 1.0 (free) x PCI Express x1 , 1.0 (total) / 1.0 (free) x PCI Express x16 , 1.0 (total) / 1.0 (free) x PCI
  • Interfaces 1.0 x Mouse - Generic - 9 pin D-Sub (DB-9) , 2.0 x Keyboard - Line-in - 6 pin FireWire , 1.0 x Display / video - Generic - Mini-phone 3.5 mm , 1.0 x Audio - IEEE 1284 (EPP/ECP) - Mini-phone stereo 3.5 mm , 3.0 x Audio - VGA - Mini-phone stereo 3.5 mm , 1.0 x Hi-Speed USB - RS-232 - 15 pin HD D-Sub (HD-15) , 4.0 x Audio - Input - 25 pin D-Sub (DB-25) , 1.0 x IEEE 1394 (FireWire) - SPDIF - 6 pin mini-DIN (PS/2 style) , 1.0 x Microphone - Line-out - 6 pin mini-DIN (PS/2 style) , 7.0 x Parallel - 4 pin USB Type A , Serial
  • Power
  • Device Type Power supply
  • Operating System / Software
  • OS Provided Microsoft Windows XP Media Center Edition 2005

I installed new ram with old one... it works...

Came home, installed new one but took the old rams out since I don't need it and replaced it with pny brand ddr2 2 1gb ram sticks ...

old power supply is Beste brand which model : ATX- 300 - 12EB3 300w

new power supply is Corsair 600w

old ram uses 2 514 ram = 1024mb pc4200
new ram uses 2 1gb ram = 2gb pc 6400

at the beginning, i add the old rams with new power supply it works fine... when i remove the old rams to replaced it with the new rams, computer will no longer turn on.... so now when i took the new rams out and add old rams back on, computer will still no longer turn back on.

I did the same steps with the old power supply still doesn't power on... no beeps, no flashing lights just green steady light on the back of the old power supply but on the new power supply shows no light at all on the back and also green steady light on the motherboard but there's no light in front of the computer tower.
My System SpecsSystem Spec

04 Mar 2012   #4

Windows 8 64 bit PRO

Please double check to see all of your connections are properly seated and connected properly too.
Is this your computer? Gateway Support - Specifications
If so they didn't mention what motherboard you had.

I suggest we try going bare minimum if you feel comfartable of course. I suggest you to unplug all your harddrives any anything that is extra.
Since we know the old Power supply (300W) was working before lets test this one.
Please plug in your Power supply to your motherboard.
If i am correct there should be 2 cables total.
Your motherboard will use either a 20 or 24 pinpower cable. since it seems like this computer is a bit old i think it will use 20 pin.
It should also use a 4 pin power connecter too.(Sometimes they are 8 pin)

Make sure the CPU is properly seated and locked in. Make sure the fan is also properly plug in.
I know personally from experience that if your motherboard isn't locked down properly your computer wont turn on.
Any beeps?
Fans spinning?

Also make sure your power supply is turn on, some power supplies have an on and off switch in the back. Like always be safe and remember to be grounded. Avoid ESD (electric static discharge.
If i wasnt clear please let me know. Doing the best i can :) Hoping we can solve this together
My System SpecsSystem Spec
04 Mar 2012   #5

Windows 7 Pro 32

what does the green steady lights mean anyway? ill try to fix it later on today since it's almost 4am and need to rest...

also the connector should be on tight when i removed and add old ram because it was fine til i replaced it with the new rams.. not sure what's going on.. other desktop used new ram but it's working fine but not this one.

yes that's my pc but it uses Pentium D rather than premium 4 same motherboard and I think it's Intel Cortez.. trying to find if there's new motherboard that uses same fan and things from old motherboard.

I think I got the ESD, I got shocked lots of times and few years back though it happen when computer was on.... this time, the computer was off but the plug was still plugged into the wall and forgot to unplug it
My System SpecsSystem Spec
04 Mar 2012   #6

Windows 8 64 bit PRO

Steady green light is usually a sign of the motherboard receiving power. However without knowing what motherboard you have i can't be 100%.

I know the issue isn't RAM. A computer can still POST, even without RAM.
RAM, HDD, Disc Drives at this moment don't need to connected.
Only motherboard and CPU and PSU.

Did you mess with the front panel connecters at all? They basically connect to the motherboard from the case. Usually control lights on case and POWER button.

You got shock while changing the RAM? or Power Supply Unit?
My System SpecsSystem Spec
04 Mar 2012   #7

Windows 7 Pro 32

few yrs back i did get shocked but still works but when i changed the ram few weeks ago, i didn't get shock and pc wasn't on but the power supply was still on plugged into the wall and forgot to unplug it and no i didn't mess with anything in the front...

The motherboard is Intel NEW~MotherBoard Gateway GT5012 GT5012H GT5014 GT5016E | eBay

looks like this one the motherboard (above link)
My System SpecsSystem Spec
04 Mar 2012   #8

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM

If the PC won't even boot now you can try resetting the bios.

If/when it does boot, i suggest going into bios setup and make sure RAM settings are correct.

If you do reset bios, check that all other settings are correct such as AHCI/IDE mode.
My System SpecsSystem Spec
04 Mar 2012   #9

Windows 8 64 bit PRO

Your Power supply seems to check ok, since your motherboard turns on a green light. If you can confirm this by testing it on a different machine that would be helpful.

It must be either your CPU or faulty motherboard, going in that order.
PLEASE MAKE SURE THAT YOUR CPU 4pin power cable is connected. This case being X. Without this there is no chance of your system doing a POST(power on self test)

Please confirm that
A, C, M, X
are all fully connected.
Unplug your computer from the wall, hold the power button. If your power supply has an on and off switch in back please turn it off and then back to on. Then plug it in back into the wall and try and power on.
My System SpecsSystem Spec
04 Mar 2012   #10

Windows 7 Pro 32

Gateway Support - U - Auxiliary Front Panel Power LED Connector

this is missing Auxiliary Front Panel Power LED Connector but I do have the front panel connector but not the led connector.

My System SpecsSystem Spec

 Desktop will not boot when I have new Power Supply

Thread Tools

Similar help and support threads
Thread Forum
Desktop Resurrection - Need power supply for 2002 Dell desktop
Wasn't sure if this is the right category but I guess it's ultimately a question of hardware... In case you don't want to read the whole background, my ultimate question is, Which power supply should I look to get to replace the dead one in the old unit? I just moved into an off-campus house...
Hardware & Devices
Advice for replacing a power supply [Desktop machine]
Right now my main computer is down with my power supply being dead. Right now I do need to get something on the cheaper side tho honestly I am really not to sure with what I really need for my system. I had a 600W power supply surely a little overkill for what I had and since I am on a budget...
PC Custom Builds and Overclocking
Bought new Power Supply Unit, won't power on. Did I buy the wrong one?
I have a Corsair CX430M PSU with 4 slots to connect in the back. CORSAIR CX series CX430 430W ATX12V v2.3 80 PLUS BRONZE Certified Active PFC Power Supply - & bought a new Antec BP550 Plus PSU, which has 5 slots to connect to. Antec BP550 Plus ATX12V V2.2 80 PLUS Certified Modular...
PC Custom Builds and Overclocking
Acer Laptop freezes on the Desktop only on Power Supply
I'm trying to help someone with an Acer 5820T laptop remotely. The problem is that if he starts the computer from a full shutdown condition with the power supply plugged in then Windows will freeze as soon as it gets to the desktop - no mouse or keyboard response. This does not happen every...
Hardware & Devices
Hardware Power Consumption-Picking a new Power Supply
Ok, so it's time again for me to pick a new power supply, however, I'm in need of some help determining the appropriate wattage for my hardware setup. AMD Phenom II X4 955 45nm AM3 GSkill Ripjaw X 16.0 GB Dual-Channel DDR3 @ 668MHz (9-9-9-24) Corsair TX750w (I dont think its the V2) ASUS...
Hardware & Devices

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

© Designer Media Ltd

All times are GMT -5. The time now is 22:05.
Twitter Facebook Google+