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Computer not turning on

T

TXAG

n00b
Joined
Oct 29, 2011
Messages
57
My computer will no longer power up. The other day I hit the power switch and nothing happened. Then, about 10 minutes later, the computer magically turned on. Now, it won't turn on at all. It will not power up when I use the power switch on the mobo, but the standby power LED is lit up on the mobo. Is my mobo dead? I really don't know how to troubleshoot this.

My computer is about 6 years old (DFI lanparty nf4 sli-dr with an AMD 3700+).
 
What power supply do you have? What other components are in the system?
 
sounds like the PSU has given up, try another one if you have a good spare, and see if that works.
 
I will post the full parts list when I get home. I don't remember the names of everything.

If the power supply was dead, would lights on the mobo still turn on? The standby power LED and the network connection indicator lights on the back of the case light up.
 
Yes a bad PSU can still supply power, it might not be able to supply enough power though. I have had this happen a few times before. But with just that information, I don't know it is enough to determine that the PSU is bad. It could be something else.
 
A lot of people will say to the paperclip trick on a PS to check if it is OK. That will only tell you that you PS can turn on and supply voltage to the fans. I have had a PS where the 5 or 3V supply was not working properly. It would read proper voltage on all the rails with the paperclip just fine however, it would not boot the system.
 
That's a cool setup. :D I still have a couple of DFI Lanparty SLI-D's laying around. :D SImply the best overclocking 939 boards out IMO.

As everyone else has said, sounds like the PSU, try a known good one. You can also jumper the 2 pins on the board to rule out that the power switches are bad also.
 
Ok, here is the parts list:

Lanparty UT nF4 SLI-DR
AMD 3700+
GeForce 210 (Used to be a 6800 GT, but it died after getting clogged with dust)
OCZ Platinum 2GB (2 x 1GB) 184-Pin DDR SDRAM DDR 400 (PC 3200) Dual Channel Kit
WD Raptor 74 GB 10000 RPM
WD HDD 250 GB 7200 RPM
Soundblaster X-fi soundcard
Power Supply: Turbo Cool 510 ATX-PFC (T51X-SLI)

I tested the voltages on the power supply and they all checked out except for one. The +5 VSB (purple wire) was at 4.40 volts. I guess that means I have to replace the power supply? Any suggestions for a replacement?
 
Depends, what's your budget like? I think any decent Antec Earthwatts, Corsair, or Seasonic will do you fine. If you plan on upgrading/getting a new rig anytime soon, you can always invest in a high wattage beefy psu. Otherwise, an Antec 620 should be fine.
 
My budget is $50-$100. I'd like to spend as little as possible. I want to keep this computer running as long as I can.
 
I installed that power supply and the computer booted up, but after the windows xp loading screen it lost the video signal. After that point the chipset fan spinned up really fast. Why might this be happening?
 
Does this happen every time you've tried to boot?

Try booting from a Linux LiveCD to rule out a possible Windows OS issue. But there may be a possibility that mobo is defective.
 
Danny Bui said:
Does this happen every time you've tried to boot?

Try booting from a Linux LiveCD to rule out a possible Windows OS issue. But there may be a possibility that mobo is defective.
Click to expand...

Yes, that happens every time I boot. I don't have a linux live cd. Do I have to pay for one of those?

Is there anything else I could try?
 
TXAG said:
Yes, that happens every time I boot. I don't have a linux live cd. Do I have to pay for one of those?
Click to expand...
No they're free. This step by step guide should help. Just remember not to install Linux at all.

TXAG said:
Is there anything else I could try?
Click to expand...
  • Try doing a repair install of Windows XP.
  • Test as much of the other parts as possible in another PC.
  • Following the steps in the stickied "Basic Trouble Shooting Guide" for a barebones setup.
 
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