PC Not booting

[bluearmy35]

Having a problem at home with my pc, when i power on there is nothing at all, i can hear a slight whirring sound for about 2 secs then it goes off. I have unscrewed the case and put power cable in and powered on and the motherboard light comes on for 2 secs when i power up but nothing else.

Do u think its a PSU problem, or more serious????

 

[BadBigBen]

yes mostlikely it's the PSU... you can test this by replacing it with a good known one, like a spare or one from a friend, before you purchase one as replacement...

Ben



If it works don't fix it! If it doesn't use a sledgehammer...

 

[Grenage]

It could be serious but it could be just a short, the best way to approach these things is just to rule out as much as possible.

Remove everything from your case, including the motherboard. Put the motherboard back in along with the graphics card, CPU, memory and power supply.

Test to see if it boots up then; if it does not then try switching out the PSU for one you know that works. If this does not work then it is most likely a processor/motherboard problem.

 

[bluearmy35]

i think i will try bens solution, replacing the PSU, as that will be far easier and less time consuming than removing it all. If that dont work i will unseat everything and try that

THANKS

 

[micker377]

Is this a newly constructed unit, or one that has been working? What CPU are you using? (INTEL or AMD)

 

[bluearmy35]

Its a Kit that was working fine before and has only starting not booting, oh its a Pentium II unit 400mhz

 

[MarkhP]

Are you using any mains filtering, a surge protector for example?. If so try without that.

 

[bygeek]

Try replacing ram. Bad ram can keep it from booting up.

 

[MrGreenleaf]

Rather then spend all the time with screwdrivers and all replacing stuff why dont you just pull a power connector and test with a dmm the yellow pin for +12volts dc, and the red pin for +5v dc, as the remove and rebuild tactic doesnt always work with psu problems, and ill tell you why. At the bare minimum (cpu, graphics, memory) Your pc is not really taxing the power supply. Several times I have seen power supplies that will not fail, until a significant load is placed upon them, (cd rom, DVD, Floppy, Zip, And 2 IDE DRIVES, for example..) So someone using a remove and rebuild would rule out the power supply as the problem at the bare bones level because it is functioniong, but then when you add a second drive or cdrom the machine would not boot causing them to replace the drive and or cd rom to just run into the same problem. Power supply issues can be very Tricky. But I would Bet my Ram on A faulty Psu in this case. Good Luck!

 

[MarkhP]

Back to the starting comments, you dont actually state that anything was done/changed or happened to cause the issue in the first place. Did it just happen out of the blue?. If you changed something, is the CPU fan on fan1 connector for instance (some mobo's req this).