HOW to do a PC HARD RESET           
 

Every OEM PC maker in the business online has these simple instructions in there MANUAL, (LT and DT lap and desktops both) 
  • There are 2 reasons to do this, simple process , the PC is dead, and needs a reset for sure after ESD or near lightening events or AC line power surges. (causes logic LATCHUP) or resets silly sleep modes.
  • Or you want to work inside any PC, at step1 cover off and hands about to touch things inside (stop your self and think) (avoiding hot swap damage caused $$$ by you)

RESETTING ANY PC:
This  is mostly a motherboard reset or is done only to make the system safe (step 5 ) to remove parts (RAM/PSU/PCI/HDD/SSD) or get the PSU ready to bench test.) 
This cures PC's stuck in sleep mode  or  with any chip (I.C)  CMOS latchup or ESD / lightening event lockups, steps 1 to 5)
If sleep mode is stuck this is only temporary fix, because your PC had bad DEVICES DRIVER SOFTWARE.  (or corrupted, or you upgraded the OS without OEM premission (means they have no W10 drivers !)

If the RTC coin cell battery is dead, replace it now, below 2.9vdc is bad. (if this tiny battery goes dead (or weak) the PC will go nuts, the BIOS goes nuts and nothing good can happen. (a hopeless place to be for a $1 part)
If a Laptop of any kind, portable PC of any kind the main battery must be removed or unpugged first. ! (and only put back later and only if you know it is good or tested good, as shorted batteries make PC's go dead)
  1. Make sure the optional PSU rear  rocker power switch is in the "0" OFF position.  IF NOT present this rocker switch then do step 2 below
  2. Remove the Thick A.C. Line cord from the wall at either end  or both ends. (this is the best way)
  3. Push the front power button for 3-10 seconds. ( the fans in the PSU may spin for 1 second and die, this action heard,  are the  CAP.';s discharging)
  4. Release the  power button now. I also repeat #3 until I see the fans stop twitching (yah get all all CAP.'s fully discharged is the GOAL here)
  5. Wait 5 minutes, touch nothing. (this wait can help you discharge the Cap.s deeper) (and is optional) 
  6. At this point you can work on the PC inside and not damage parts removed or installed hot swapping them.
  7. If  only doing the hardpower reset then  reverse steps 1 to 4 and PC now it runs and works perfectly (but may fail again soon if you our PCs drivers are bad and sleep locks up again) Sleep mode can lockup, and is common.
  8. If only doing internal service to the PC you are now safe to work (you safe and no damage to the PC) do not HOT SWAP parts in any PC. (inside parts, ALL)

If the PC still  fails remove the RTC Coin cell, and repeat  step 1 to 5, then put it back and reverse your steps.
If the coin cell was bad and replaced with new, as a last step in BIOS, go in to the main page of BIOS (no 2 PC use same keys) but in Dell we push F2 at power see BIOS page 1, and do a set BIOS defaults now)  and exit.
Last and on topic I wear a ESD wrist ground stap to work on all PC internals. (the link shows the huge damaging levels of ESD possible)

version 1.  12-9-2017 (revised 7-1-2019)