[Eradicator]

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[Harrier]

Dead mobo or dead PSU. Try each in a different system. Whichever one fails need replacing. It could be the ram, but it would beep.
We've had a lot of PCs come in this week which suffered from power surges which blew the PSU which also took the board out.
You could try putting a different PSU in, if it does the same it's not the PSU. Put your RAM in another PC and run MemTest (google it). If those 2 fail then it's the board of CPU. Try a different CPU in the board, if that fails then your board is dead. Also, when you get it working again, check all of the hardware (RAM, HDD etc.) just to check.

 

[Eradicator]

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[Harrier]

Nah. Just because the PSU turns on doesn't mean it works. When most PSUs fail, they always turn on, and will just cut out and your PC will restart when you are doing something. The timing is random, but since it always cuts out at the same time for you it might not be a dead PSU. Does it POST?

Hardware can be dead but still functional. What I mean is, just beacuse it turns on and works for a little while, doesn't mean it is not dead. For example, some broken things onnly cause the computer to BSoD/restart when they are under load. Think of overclocking, just because it boots up with an insane overclock, doesn't mean it is stable. As soon as you put it under load it will just crash.

A CPU dying is actually quite rare, you really would have to hammer it. But nevertheless it does happen. And looking at your rig, the overclock and voltage are nowhere near destroying the CPU. 3.4Ghz on an i7 is low and the voltage is very low too.

 

[Eradicator]

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[Harrier]

Quote:

Originally Posted by Eradicator I do not understand what you mean by that

I mean: When it turns on for a few seconds, do you see the BIOS screen? or anything on the screen?

If you have no other machines you can test the parts in, then you really are screwed

 

[Eradicator]

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[Harrier]

Probably won't help but: Check the connections from the PSU to board, especially the 24-pin and 4-pin connectors.

 

[Eradicator]

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[Harrier]

Tried a CMOS reset? Take battery out of the mobo for 30 seconds and put it back in. If that fails, then you need to get testing.

 

[Eradicator]

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[mr. biggums]

try running your rig outside of the case on the mobo's box there's a good chance that the mobo's shorting out from the new mounting hardware.

 

[superk]

try a single ram stick.

if you think it might be the PSU, take a paperclip, disconnect the 8pin and 24pin connectors from the motherboard. Shove the paperclip one end in the green wire and another on a black wire (any black wire will do) this should 'trick' the psu into turning on.

have you tried remounting the heatsink and cpu? its possible that something came loose. Did you remove the motherboard when installing the heatsink? If so its possible the board itself is shorted somewhere on the case. Try an out-of-tower build with everything connected. If it still fails to POST then we have a problem. At that point I would recommend a bios reset.

EDIT

If you hav a volt meter you could use it to test the voltages coming out of your power supply.

 

[Eradicator]

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[superk]

try reading my post before doing that.

 

[Eradicator]

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[superk]

well its possible that your loose cpu mount could be the problem. the added pressure of the scythe may have offset the alignment causing the board to be broken. unlikely, but possible.

did you try it with a single stick of ram? try it with no ram, it should beep at you. Try jumping the PSU like I mentioned, if your PSU does the same thing, its a PSU issue.

Also, disconnect all unneccessary equipment including hard drives, dvd drives, expansion cards, fans, even usb devices.

 

[Eradicator]

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[superk]

just shove the paperclip in the holes, or even in the backside of the holes. do not remove the wires

 

[tagurtoast]

my mate had this prob try rmaing your mobo