How to solve a dead PC?  ( Do the long hard reset first or the short one?)
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.

  1. My PC Died diagnostic flow chart is here:    (testing in the correct order is key to success)
  2. A simple Dead BIOS flow chart. 
  3. A Dead Desktop Monitor diagnostic flow chart. (VGA/HDMI/DVI/DP) See 2010 dead CCFL LCD back lamp tests.
  4. See the flow chart of  a typical monitor the inside major firmware logic.
  5. The PC is overheating? (why and cures and why this makes any PC slow) and all cures.
  6. HDD problems and all tests and cures for the Hard disk drive or upgrades. (SSD and external HDD too)
  7. Why Windows 10 installs fail, (HDD not bad)  Outdated PC's. or does  not like your very old IGPU/GPU  (the cure is here)
  8. Dead PC strip down testing.
  9. How to test any suspected HDD  ,or how to use external HDD,  and last how to run demo Linux to test any HDD or How to backup data.
  10. What to do if you lost your Passwords (not Wifi). BIOS and the OS. (with relic Toshiba jumper support)
  11. My two Dell PCs,  3020MT and E6540, problems solved and support links. Both have onboard ePSA diagnostics !
Bad sounding noises:

Running a CPU with no fan or heat-sink, it burns up. ( new PC's shut down 'Intel Inside"™ magic ends the smoke P4 and newer.) 

My PC is slow why?, well all  PCs do that with age. (lots of causes see them here)

My page on PC secrets, things, parts and devices not standard and how to deal with that. (OEM PC's )
I have this PSU testing page, that covers the simple bench test.

Off topic (track)
    Sony PS3?
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)

Learn Rule #1 first,  Software does no run on bad hardware, so learn to bark up the hardware tree first. RUN DIAGNOSTICS first.

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Rated by: and YMMV and "Faster than the Speed of Dark"