Cant seem to find problem

gibbingslfc

gibbingslfc

gibbingslfc

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29 Nov 2011
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I've been running a PC with these specs:

  • Corsair HX 650W
  • Intel i5 2500K (SandyBridge) CPU
  • Asus P8P67 Mobo
  • HD 7970 VAPOR-X GHZ 3072MB GDDR5 PCI-Express Graphics Card
  • Corsair Vengeance Low Profile 8GB (2x4GB) DDR3 PC3-12800C11 1600MHz Dual Channel Memory Kit (CML8GX3M2B1600C11)
  • Samsung 250GB SSD 840 SATA 6Gb/s Basic - (MZ-7TD250BW)

And recently the machine just stopped switching on out of the blue. The lights inside the case are lit up but upon pressing the power button the fans fail to spin up. I took it to a shop and they told me that its more than likely that the motherboard needs replacing -- so I replaced it and I was still having the same problem.

I took it to a different shop and told them the story so far, they had it for around 1 week and told me it must be the motherboard, so I returned the new one and had it replaced. It arrived today, I put it in and I still have the exact same problem.

I have turned to this forum to get some ideas about what it could be, I've been without my PC for around a month now and I just want it back.

The new motherboard: Asus P8Z77-V LX Intel Z77 (Socket 1155) DDR3 Motherboard
 
Most PC repair shops will just try to get you to buy new parts, when it is probably not required.

I would try the paperclip test first as shown above, to rule out the psu.
 
Firstly try resetting the CMOS by taking the battery out and leaving it for 15 minutes. If that doesn't work I'd try running the motherboard outside the case, on a piece of cardboard to rule out shorting on the case.
 
Try this if you already haven't, so we can rule out a faulty power button.

Check your motherboard manual to see which 2 pin header the power button connects to, and then touch the pins with a flatblade/philips screwdriver as in the video.

 
If it's not the motherboard and PSU then it's likely CPU, memory would probably just beep or fail to post rather than the power cutting out. Remove the Radeon and all non essentials and if it's still the same pick up a cheap Celeron/Pentium just to be sure it is the CPU before splashing out on a decent one.

edit: do what lee32uk says and test it's not the case button first.
 
Last edited:
ExRayTed said:
Firstly try resetting the CMOS by taking the battery out and leaving it for 15 minutes. If that doesn't work I'd try running the motherboard outside the case, on a piece of cardboard to rule out shorting on the case.
Click to expand...

lee32uk said:
Try this if you already haven't, so we can rule out a faulty power button.

Check your motherboard manual to see which 2 pin header the power button connects to, and then touch the pins with a flatblade/philips screwdriver as in the video.
Click to expand...

I have tried both of these things, but neither of them worked, thanks for the suggestions though.

mmj_uk said:
If it's not the motherboard and PSU then it's likely CPU, memory would probably just beep or fail to post rather than the power cutting out. Remove the Radeon and all non essentials and if it's still the same pick up a cheap Celeron/Pentium just to be sure it is the CPU before splashing out on a decent one.

edit: do what lee32uk says and test it's not the case button first.
Click to expand...

I'm starting to think this, I've tested the memory with some spares and I got no results so the CPU being at fault is looking more and more likely however I want to be as sure as I can be before spending money on hardware.
 
to test for faulty front case power switch,disconnect the + - wires from the mb headers and touch both of them together momentarily with a flat bladed screwdriver,the board should then start
 
ohh I missed that

can only leave cpu then

tried building outside the case just to rule out any short circuits?
 
wazza300 said:
ohh I missed that

can only leave cpu then

tried building outside the case just to rule out any short circuits?
Click to expand...

Yeah, I've done that too, it's looking like its the CPU, I think i'm going to get a 30£ Celeron just to see. I got the CPU I have at the moment back when SandyBridge chips first came out.
 
Distance Selling Regulations It means you can cancel/return your order within 7 days of purchase. From 13th June Consumer Contracts Regulations will come into place/replace DSR main difference will be consumers will be given 14 days after purchase to cancel instead of 7
 
Last edited:
dacads said:
Distance Selling Regulations It means you can cancel/return your order within 7 days of purchase. From 13th June Consumer Contracts Regulations will come into place/replace DSR main difference will be consumers will be given 14 days after purchase to cancel instead of 7
Click to expand...

Ah that's cool but it does seem a little heartless, buying something with no intention of keeping it. ;)
 
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