How to solve a dead PC?
Learn that PCs have on average about 20 major parts (modules) that if fail or short the PC goes dead.
Using simple flow charts or first checking these items.
Replace known to be bad or test all batteries first. (RTC coin cell battery replaced) See battery slide show here.
Push the power button for 10 seconds and release.(cured?)
Or pull the AC line cord from the wall jack and let the PC rest for 1 hour no AC power. ( this is the hard cold reset) for Desktops)
If this is a laptop, ( reset the laptop for 1 hour with no AC power pack and no huge battery installed or disconnected )
Laptops remove the big battery and run on AC power only on laptops. (even forever) That battery can short and this overloads the power regulators in the PC.
After bad batteries comes, bad HDD the #3 top of list order of failure by age. The test is simple read this short page.
My PC is slow why?, well all PCs that with age. (cures here) this topic is huge, as slow has vast causes.
OFF SITE links on topic dead PC.
To diagnose any PC, use a simple flow chart after replacing the batteries first. ( or these famous gems)
Last and best is this ASUS.com Desktop trouble-shooter.(no power on at all, no boot or no post and no display)
Certified (no GMO here, no fat, no sugar , and is 100% Gluten free, zero spam, zero tracking and zero explotations here, even Kungflu free !)
Rated by: and YMMV and "Faster than the Speed of Dark"