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: I need help with my custom built pc not turning on please.....

13 Dec 2010   #11

Windows 10 Pro

Also, a big mistake first time users make is forgetting to connect the 12v 4 or 8-pin connector to the motherboard, If that cable isn't connected, the system won't start.

I need help with my custom built pc not turning on please.....-mb-cables.jpg

Ultra X4 750-Watt Modular Power Supply - 135mm Fan, ATX, Lifetime Warranty w Registration, 80+ Bronze, NVIDIA SLI & ATI Crossfire Certifications, Vibration Dampener Included U12-40504 at

My System SpecsSystem Spec
13 Dec 2010   #12

Windows 7 Ultimate x64

Wow, thanks all SO much for your feedback. Right now I have the computer on the table and I'm reconnecting all the wires etc... Also, I THINK I found what was wrong but I won't find out till I try to turn the comp on. I noticed the power cord connecting to the mobo was not completely clipped in. Even though I pushed it in and it clicked, I'm still going to look over all the feedback you all have given me before I try and fire it up. Yea, when I build a computer, I go all out... it's just me I guess lol. :) Thx again, I'll check in asap.

My System SpecsSystem Spec
13 Dec 2010   #13

Windows 7 Ultimate x64

I tried all of that, it's all connected properly, however it's still not booting up. The first power supply I had in that pc was an 800w, then 700w and now this awesome 750w psu all crapped out. I'm hoping it's the psu because I'll admit I 'DO' oc my gpu's sometimes but I make sure they're staying cool. The only thing I saw in my BIOS that was in RED, was the speed of one of the mobo fans, I think it was the PSU fan but it wouldn't let me speed it up or down. I'm going to get a cheap 40 to 60$ psu tomorrow and hook it up to see if it works so I know what the issue is. But, any info you all have for me from here on out would be greatly appreciated. Thx!!

My System SpecsSystem Spec

13 Dec 2010   #14

Microsoft Community Contributor Award Recipient

Windows 7 Ultimate 64

Maybe you could take the PSU in and have it checked quickly before purchasing the new one. Did you buy any of these PSU or other stuff from a local store with a service department?Thermaltake TRX-750M TR2 Modular Power Supply - 750-Watt, 80 Plus, 4X PCI-E, 6X SATA at TigerDirect
My System SpecsSystem Spec
13 Dec 2010   #15

Windows 7 Ultimate 64bit

The 3870 uses about AC 84/DC 72watts of power at full load.
3850 is 64/55watts.
Idle watts for 3850 and 3870 cards are in the 11-20watt range.
My System SpecsSystem Spec
14 Dec 2010   #16

Windows 10 Pro

Quote   Quote: Originally Posted by jimb0616 View Post
The only thing I saw in my BIOS that was in RED, was the speed of one of the mobo fans,
You either have somethig wrong with that power supply or something wrong with the connections.

Something you could try is hooking up items one at a time. This should help in telling you when the problem lays.

Good luck.
My System SpecsSystem Spec
14 Dec 2010   #17

Windows 10 Pro x64

Disconnect ALL cables
Connect a fan or something similar to the a power supply molex
Using a wire connect the green wire on the 24 pin plug to one of the black ones.
Start the computer the fan will be the only thing connected if it runs the power supply is working
I will supply a link to a Tutorial on PSU's that was made by a team of experts
My System SpecsSystem Spec
14 Dec 2010   #18

Windows 7 Ultimate x64

ADDED INFO: my mobo is Asus M3A32-MVP DELUXE.. just fyi..

Thanks everyone, I'll go ahead and try all that stuff later today. As for where I bought all the parts, I DID get every single part from CompUSA aka Tiger Direct and still have the receipt but I built this about 4 years ago or 3. I do have two 3870's, I've OC'd them and the fans on them many times but 90% of the time I had the PC on I had them at default settings. When I went through the pc and connected the HD's to 1 wire each instead of two on one and reseat everything, also checked to make sure the mobo wasn't making contact with the case, none of that seemed to fix the problem. God, I really hope it's not my mobo, it's expensive lol... well it use to be. It's an Asus Deluxe something, I'll get the spec info off the receipt and post it later. Thx for the links and info, I'll check in again later today. Take care everyone. This is a great site btw, lots of very educated info :) nice work. Later

PS - This is the only build of mine that I've had issues with, all my past builds still run to this day, even my very first build over 12yrs ago... I get upset with myself when I can't fix my own rig. Bringing it to the store to have them check it out is a huge downer for me because half the time they don't know what they're doing lol, and also charge you an arm and a leg just to do something as simple as adding ram!!... which only takes seconds. anyways, thx again

My System SpecsSystem Spec
14 Dec 2010   #19

Windows 7 Ultimate x64

OMG!!! What I just did, was I took the 12v/8pin out of the mobo and I just tried to turn the pc on AND EVERYTHING TURNED ON!! but i quickly shut it off because the 8pin was unplugged and I didnt want to dmg anything.. but when I plugged it back into the (top left area of the mobo) mobo it wouldn't turn on. Please don't tell me my mobo is dead... I've never come across this type of thing.
My System SpecsSystem Spec
14 Dec 2010   #20

Linux CENTOS 7 / various Windows OS'es and servers

Quote   Quote: Originally Posted by sygnus21 View Post
Uh that 750 watt power supply is plenty powerful enough for that system. Period.

I'll tell you I ran my system on a 550 Watt power supply no problem. Check my specs. Now you'll notice I have an 850 watt now, but that's more to do with that power supply as I wanted it. Do I need a 850 for the current system? NO!

I will tell you that your 750 will power those two 3800 series cards you have. One thing to check though is your connections, and that you don't have one rail overloaded with other stuff like fans and hard drives on the same rail powering the video cards.
750 Watts -- I could probably heat my whole house for that.

What can happen sometimes is that the Power LED and Microswitch get burned out / corroded. If that happens then the computer won't turn on.

I suggest you look at the Power LED connections with your computer case and check at least if any of the fans start up when you switch on.

If you feel competant at Engineering short out or bypass the Computer switch so it powers on automatically from the mains when plugged in.

Check also that the RESET LED isn't also corroded / broken.

I've had a few computers over the years which were totally dead untiil I fixed the LED / switch problem.

Why on earth however you would need 750 WATTS for power -- you could Microwave a Sunday Dinner for 4 people with that amount of power.


My System SpecsSystem Spec

 I need help with my custom built pc not turning on please.....

Thread Tools

Similar help and support threads
Thread Forum
BSOD 0x00000124 on a new custom built PC
Hello SevenForums! I keep getting BSOD error 0x00000124 on my brand new custom built pc, drivers and BIOS are updated and everything set to ( Auto/Default ). i did reinstall all the hardwares and made sure everything is installed right, reseated cpu,heatsink and all. run memtest86 overnight and...
BSOD Help and Support
Had a Custom Built PC-Monthly BSOD, is now turning more frequently.
Hey Guys. I could really use some help with an issue I've been experiencing. It's a bit of a long story so bare with me and I'll try sum it up as best as I can. I custom built my computer almost six months ago now. Here are some basic specs: Windows 7 Home Proffesional 64 bit, Cpu: I7...
BSOD Help and Support
Custom Built PC Input
Hey all, I am thinking about building a new PC and was wondering if the components I have are worth it or being replaced with something a little better. This would be my second build and thought some input would be good. These are the components I was thinking about getting: MSI GTX 570...
PC Custom Builds and Overclocking
New custom built PC will not turn off
Hi, I recently built a new computer for my brother, and as of yesterday, the system will only power on, and the only way to power it off is by either turning off the PSU or unplugging the power cable, neither of which I feel particularly comfortable doing. When the computer's power is off,...
Hardware & Devices
Custom Built in Progress
Hi all, I'm in the process of putting together a new custom built overclocking PC for Windows 7 and some light gaming. Due to work and items on shipment, I have to delay the built and only can work on it on the weekends and when shipment arrives. Here's what I got so far: CPU - Phenom II...
Chillout Room

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 06:18.
Twitter Facebook Google+