Windows 10: running pc fine for years took the processer out cleaned and renewed thermal paste

i decided to redo the thermal paste on my processer after 4 years or so the system has been flawless with no problems i put it all bk together then noticed i had no sound i thought this was just a driver issue i reinstalled windows and still nothing i also the proceeded to put windows on another hdd still the same so i thought i had broke the motherboard i have bought a new motherboard and same issue wont take the chipset drivers?i can install them but nothing shows up in device manger at all realtek or nothing this has me stupped please help tryed everything could it be the cpu is damaged but

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PC not starting after Applying thermal paste

I brought the isopropyl alcohol and cleaned the card but the system does not boot up even without the card the mobo seems fine I cleaned up some capacitor the might have been exposed to thermal paste any suggestions ?

 

GPU Thermal Paste Questions

So after years of accumulating dust, I decided to clean out my ASUS GTX 670 DCU II.

After removing the heatsink to clean it out and also access the fans; I was left with a problem and I need answers:

• Do I have to re-apply thermal paste? Is it fine just to put it back with the set stock thermal paste
• What thermal pastes can I use? I have Arctic Silver 5, some ancient Zalman STG1 grease and a tube of CM paste included with the 212 EVO
• Can I use methylated spirits to clean off the existing grease?
• How much to apply? Where should it spread/be spread to?

Any help would be greatly appreciated.

 

Best thermal paste

Most decent thermal paste is about all the same (1-2 degree difference). Without knowing the two listed, (I use MX-2), I would suggest going with the one that is non-conductive.