Pc won’t turn on after installing new cpu

March 15, 2019 at 19:34:21
Specs: iPhone
So I had an i5-6400 and I decided to upgrade to a
i5-8600k I remove the old one and put the new one in I cleaned and put new thermal paste. I plug it in and press the button and nothing happens no fans nothing I’ve checked the cpu pins the ram all the wire are in right and none of that worked so I put in the old one again with new thermal paste and everything then I turn it on all the fans go but none of the usbs or hdmi work I have my hdmi on the graphics card not motherboard and now idk what to do been doing this for around 3 hours.

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March 15, 2019 at 20:10:27
Process of elimination.

" I have my hdmi on the graphics card"
Take the card out & test with onboard.

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March 15, 2019 at 20:37:38
Would it be the thermal paste if it’s not turnings on at all

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March 15, 2019 at 20:45:58
Does the motherboard support the new CPU??

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March 15, 2019 at 20:49:02
"Would it be the thermal paste if it’s not turnings on at all"
You are trying to find a cause, if the cpu has overheated, maybe there is damage affecting start up.
what can happen if thermal paste not applied correctly

Connected up wrongly is more likely.

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March 16, 2019 at 05:51:28
There's 2 things you should have done before swapping the CPUs - the 1st was to check for compatibility. The i5-6400 is a 6th gen CPU; the i5-8600k is an 8th gen CPU, so that could be a problem. If it was found to be compatible, the 2nd thing to do would be check BIOS compatibility & update (if necessary) while the old CPU is still installed. Please post the make/model of your motherboard.


Another possibility is the thermal paste was applied incorrectly as was mentioned. Too much or too little paste will prevent a system from booting. Core CPUs generally require the "vertical line" method.

message edited by riider

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March 16, 2019 at 21:38:21
dmcnair> First we need to find out what motherboard is involved before recommending any change out. Second, remember that a change in the motherboards causes issues with the Windows install so that needs to be considered seriously first. Most likely is CPU compatibity, thermal paste, or failure to replace a plug after swap out/upgrade, possibly more than one.

Jahir009< Please answer questions on all of your current hardware, review thermal paste installation instructions per links above. Also carefully look over all connectors for proper reinsertion. Did you make sure that the system was unplugged at the time? Did you take a moment and discharge any static build up on yourself before touching any internal component? Did you at anytime feel a tiny shock or static discharge touching anything inside the computer's case?

You have to be a little bit crazy to keep you from going insane.

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