HOW to do a PC HARD POWER  RESET           
Is your PC dead?
BIOS screens dead too? Monitor shows NO SIGNAL or the like?
The are many ways for PC to lock up this cures about 5 causes.
I also show how to this reset for servicing the PC hands on inside.

I will do this page in 2 parts, one is for PC is dead (how to do simple hard power reset, and how to do service on  a PC, and not blow parts to H3LL.
The PC called a Laptop remove the big battery and test with no big battery there on AC power Pack only. (if a battery shorts the PC will be dead)
If the PC is Deaktop there is no huge battery there, but all PCs have  RTC coin cell battery that if dead , BIOS screens can go dead, and the PC.

If the RTC coin cell battery is dead, replace it below 2.9vdc. (it costs only $1 to replace it, and only lasts for 5 to 7 years)  On any desktop this is childs play on Laptops , from easy to pure hell is possible on laptops.(RTM?)

If you like videos, on this see this one here. (shorting the battery socket battery out is useless, it has diode block there to prevvent south bridge damage, yes intel is smarter than noobs !)
This is  just the steps for for a hard reset, not doing service on the  PC, covered in the next frame.
This is not hard at all, and resets all ESD and latchup events, even stuck in sleep mode events. (the latter is bad software drivers in the PC's OS)
If a laptop that  huge battery in the PC must come out first, some are easy , just drop off bottom and some thin notebooks pure hell to reach. (on a real desktop this is just 4 steps, and is really childs play simple)

  1. Remove the Thick A.C. Line cord (cable) from the wall Outlet
  2. Push the front power button for for 1second  up to 3 times,  if the fans stop twitching  and all LED go DEAD that tells you all CAPACITORS in the PC are now fully 100% discharged (goal #1)
  3. Wait 5 minutes, touch nothing.
  4. Put back the A.C line power cord in the PC and now the PC runs ok or at least BIOS works and its BIOS HOT keys all work.
Just 4 steps, to reset it,  is this simple enough?
If this fails make step 3 , 1 full hour long. (even over night in very extreme cases)

Servicing any PC and not wanting to blow up expensive modules inside any PC.? (work safe don't blow up $300 components, ok?)
Rule #1 on all PC's is never remove and HOT swap parts inside  ever !,  that means with the AC line cord to the wall AC jack, at anytime, if you do this wrong  you will blow up the part and /or the MOBO. BOOM !
Do step 1 to 3 above then... (on a laptop of any kind the big battery was remove long ago above)

  1. Let the PC site dead per above,  for say 1 full hour and hope for all capacitors inside, are fully discharged. (goal #1 doing any service inside) OK?
  2. At this point you can work on the PC inside and not damage parts removed or installed hot swapping them.
  3. The PC is now safe to work inside, now.
  4. Never hot swap any DC power cables  inside any PC, with AC line cord connected, the PSU never really turns off is why this is true.
  5. Do not hot swap PCI cards of any kind nor SATA power or GPU card power cables. (most have colored wires, and are DC power)  See link above for other rules on power.

The hard reset cures that cause  of  failures. (some are only temporary , and stated last in the list.)
  • ESD events, you the human are charged up with electrons,  just like getting a spark from a door knob touched ESD cause CMOS chip latchup (passive or active) ( the coldest days of winter are worse at 0% humidity)
  • Lightening events (minor),  (or far worse there is no limit to worse)
  • Power line surges of any kind for any reasons. (Buy a UPS and use it?)
  • Sleep mode stuck (only new and matched drivers is the cure)
  • Cockpit errors, users hot swapping anthing inside any PC.
It does not cure a true dead PC nor cure dead batteries of any kind or the RTC battery dead and now PC is dead or looping boots endlessly.

What is CMOS latchup (a Parasite)?

What is chip input protection latchup (on purpose)? (answer is vast but a simple diode pair or zener diode pair  or TVS device works) there are smart active protections too,, that assume one hit will follow with many more and stronger)

What is ESD latchup and protections ?, see line 2 above. (some can protect pins up to 25,000volt spikes of ESD events. (even minor lightning hits)

See smart protections here. (first is SCR protecting see the low hold-in words and how the above reset methods release this SCR device)

The thing to learn here is that those clamps can hold in until all power rails  go to very near zero 0volts. or below 0.3vdc.

version 4.  12-9-2017 (revised 1 -1-2020)   I split the page so folks don't get confused. (latch up and service mode)