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Windows 7: PC doesn't turn on after powering off

25 Feb 2014   #11
Layback Bear

Windows 7 Pro. 64/SP-1
 
 

Replace the power input cable. May help, can't hurt. Look for any signs of being burnt.
The cable that goes from the wall socket to the power supply.
Make sure it is a cable designed for a power supply and not a video screen. They have the same ends.
My power supply cords are either 14 or 16 AWG. This is found on the cable.
The smaller cables are not rated for the proper amps.

American wire gauge - Wikipedia, the free encyclopedia


My System SpecsSystem Spec
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25 Feb 2014   #12
ICIT2LOL

Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10
 
 

My 2cents worth take a look at this and then test the volts at pin 8 (grey) on the 24 pin if this voltage fluctuates lower than 2.4 or higher than 6.0 volts then the PSU self test is failing and the PSU is faulty.

http://www.tomshardware.com/reviews/power-supply-specifications-atx-reference,3061-2.html

see Power_Good in section 2.

PS Use a digital multimeter not the analogue type RED lead pin 8 BLACK lead any black pin or even the board fixing screws.

It might even be worth testing the resistance between a black 24 pin lead and the board fixing screw. So set to resistance (OHMS) and touch across the machine ideally should be shut down and should read zero ohms.
My System SpecsSystem Spec
25 Feb 2014   #13
madcratebuilder

Win8/8.1,Win7-U64, Vista U64, uncounted Linux distor's
 
 

Unplug all PSU cables except the 24 pin and 4 pin atx mobo cables. If it still powers on for just a few seconds it's probably a short in the mobo.
My System SpecsSystem Spec
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26 Feb 2014   #14
cedsays

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

Quote   Quote: Originally Posted by madcratebuilder View Post
Unplug all PSU cables except the 24 pin and 4 pin atx mobo cables. If it still powers on for just a few seconds it's probably a short in the mobo.
I've tried this. There is a green light on the mobo but nothing powers on
My System SpecsSystem Spec
28 Feb 2014   #15
AmericanPharaoh

Windows 7 Home Premium 64-bit
 
 

The green motherboard light means it's getting power, but doesn't mean the motherboard is working.

Pull out the RAM sticks, then try one stick at a time. See if it will start.

You can also, take the CPU to a shop and have it tested.

Perhaps, some of our others members will have more suggestions.
My System SpecsSystem Spec
28 Feb 2014   #16
ICIT2LOL

Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10
 
 

Mate try leaving the 24 pin in and just test the cables to the CPU and GPU etc etc if there is no volts coming through then that may indicate that the CPU (or the GPU) is getting no supply.

Do you get any beeps at all on power up? Maybe the RAM is shot might be worth trying this.

MEMTEST

http://www.sevenforums.com/tutorials/105647-ram-test-memtest86.htmlthis one you will need to make a bootable disk set the BIOSto optical (or USB if preferred) boot the machine and let it run for at LEAST 8 passesunless the errors come upstraight away. Takes a fair time to complete and some leave it runningovernight.

If you do get errors and have morethan one stick then you will need to test each one separately and maybe even inthe separate slots.
My System SpecsSystem Spec
28 Feb 2014   #17
Shabakthanai

Windows 7 Professional 64bit
 
 

Quote   Quote: Originally Posted by cedsays View Post
It was only a matter of time before it kicked off. Going to be a long 4 months until I can afford it. Shall I mark as solved or leave open for a few month until I get it fixed?
Not sure this will help, but I would try it before I replaced the Mobo. Shutdown and disconnect the power cord. Wait for about 20 seconds.

Remove and replace the CMOS battery and restart your computer. This will start you off fresh as with a new build.

It is a lot of work, but not so much if it works. Hope this helps.
My System SpecsSystem Spec
01 Mar 2014   #18
Wandering one

Win7 sp1 Pro 64bit / XP sp2 Pro (games only)
 
 

For what it is worth I had the same thing happen a couple of years back. First thought was PSU. Didn't help but needed better on anyway. We were travelling around the Yukon and Alaska at the time and really needed the computer. Desperation says WTF can't do any worse,(maybe) so I tried removing all the cards on mobo, tuners, video etc. Obviously with video out nothing is visible but lo and behold, a miracle. When powered on the HDD active light is keeping its flash a second seek light going. Put cards in one at a time and it was the video card killing it. Found new video card (this part hurt) $125 for a cheapie that cost $37 in Calgary but beggars can't be choosers and it worked perfectly for the rest of the summer.

This may or may not help you but the price is free. Good luck,
Art.
My System SpecsSystem Spec
04 Mar 2014   #19
Alpha

Windows 7 64-bit, Ubuntu 13.10 64-bit
 
 

I just dealt with a power switch problem on one of my computers. To test if the motherboard headers were working correctly you can jump the circuit without the power switch (carefully with a screwdriver). I fixed the issue by going to radioshack and buying a momentary power switch. Any momentary power switch should do because all your doing in connecting a circuit. I cut off the old switch and wired on the new one. Computer works great now.
My System SpecsSystem Spec
23 Apr 2014   #20
cedsays

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

It's been a few months but I'm back! I've finally purchased a new motherboard and CPU. My problem now is the hard drive isn't booting. "reboot and select proper boot device. I've tried everything to get into BIOS but no luck. Would I need to purchase a new hard drive to work with a new mobo/cpu?
My System SpecsSystem Spec
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 PC doesn't turn on after powering off




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