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Cpu dead?

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I recently built a computer for a friend who unknowingly had it on a bad backup battery, his area is also plagued with power outages and the backup battery does nothing to soften the blows, with this is mind here we go.
>Computer refused to boot, all case fans jolted (didn't spin but just shook and went dead)
>Tested a different psu, same result
>Removed 4pin cpu connector and all the fans came on and the pc stayed on (nocpu=nopost)
>Changed motherboard, to a GA-H61M-DS2 rev2.2 so, it supports the g1620 out of the box apparently.

Current symptoms after board change:
>Computer now in a boot loop, everything powers on for 1-2 seconds then reboots doing it again in an infinite loop until power is disconnected.
>Removed 4pin cpu connector and everything stayed on.

During all of this testing, ram was replaced and tested in other systems and they are fine, gpu was also tested and it checked out, everything was checked on the motherboard box to ensure no shorting, minimal components used to rule out faulty usb, hd,gpu etc.

So, I am completely stumped and any advice would be appreciated right now, did a power surge kill the cpu and previous mobo?
 
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Could be dead. I would try to reseat the cpu one more time. Apply a light but, positive downforce when clamping it locked. If still no post...dead.

Seems you have likely ruled out any other causes. The original MB might still work but the CPU is likely done.

2 cents :)
 
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well I've given up for the day, il try to find a processor to pop in and check
 
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If the fans just jolt a bit when you power it up it could be a short. I had those when I was playing around with metal pegs in an older case that were probably touching something on the back of the motherboard.
 
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134 (0.03/day)
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Guyana
System Name Windforce
Processor i7-4790K @4.4ghz
Motherboard Asus ROG Maximus Gene VII
Cooling Swiftech H220X
Memory 12GB Corsair Vengeance Pro
Video Card(s) Gigabyte GTX 970 G1 Gaming
Storage 1x Western Digital 160GB 1x OCZ ARC 240GB SSD
Case Corsair Carbide Air 240
Power Supply Corsair TX750
Mouse Roccat Kone Pure
Keyboard Coolermaster CM Storm Quickfire TK
Software Windows 10
No chance of a short since everything was tested on a new board on a box and not the case
 
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