CPU or Motherboard dead?

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sambostrand

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Jun 22, 2014
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Last night I was having trouble with my rig displaying through displayport after it has been in sleep mode. Usually I switch quickly over to hdmi and make sure it's back on high performance mode and reset the bios via the board and restart. (This has always fixed it)
However this time after a few restarts it booted and to my surprise the mouse and keyboard didn't seem to be working. I restarted once more and now the pc does not even post. This is strange as it has never done this before.

I read up on a few forums that I should reset the cmos on the motherboard but first I took it apart and tested to make sure it wasn't anything else first. Tried with bare bones cpu, ram and gpu all connected still starts up but immediately restarts in a loop and doesn't make it to bios.
Tried the cmos tricks and it does the same. Tried a bios flashback and still no good.

My components are Asus vi formula, I7 4770k, gtx 780ti.
I've been using this setup for months, cpu never breaks the 40 degrees limit with the h100i.
I can't tell if it's the motherboard or the cpu that's fried.
 
Solution
C12Friedman
Sounds like the CPU had been de-lidded - you'll want to look at a few vidoes on delidding to see how to replace the thermal compound there and put the heat spreader back on proper. With that information I think the more likely suspect would be the CPU - I'm thinking far too aggressive an overclock perhaps but check out the de-lidding vids, get it back together - see where you get then.
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C12Friedman

C12Friedman

Glorious
Jan 25, 2012
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Probably isn't the PSU then. Hopefully we can get this sorted easily here.
Try taking out the graphics card, remove all graphics drivers. Run with on board graphics (a nice reminder of why you got a good graphics card) and the display port connection. If no issues after a few boots, once again, remove all graphics drivers then turn off and unplug the machine. Put the graphics card back in (make sure it's in fully), plug in, start up, get your graphics drivers from the card's manufacturer, try your display port through the graphics card then.
 
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sambostrand

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Jun 22, 2014
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4,510
Sorry must have mislead. The gpu isn't an issue and neither is displayport now. The machine won't boot at all. It switches on and switches straight back off, rinse and repeat.
I've had it stripped down to bare bones and same outcome. Tried a different stick of ram and no change.
I've had someone tell me the motherboard is shot as it's a low probabability that the cpu will have just died.
There are no beeps upon boot and no post.
 
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sambostrand

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Jun 22, 2014
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4,510
Just opened it up again to take a closer look at the board for any shorts that may have occurred. Nothing visible.
However I removed the cpu which I received second hand along with the board and to my surprise upon removal the head spreader came clean off showing a the tiny mirror like heat disperser with a silver like gunk on it (not the thermal paste that was on the spreader) could this be the cause?
 
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C12Friedman

C12Friedman

Glorious
Jan 25, 2012
8,966
1
46,965
Sounds like the CPU had been de-lidded - you'll want to look at a few vidoes on delidding to see how to replace the thermal compound there and put the heat spreader back on proper. With that information I think the more likely suspect would be the CPU - I'm thinking far too aggressive an overclock perhaps but check out the de-lidding vids, get it back together - see where you get then.
 
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