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  1.    10 Apr 2017 #11
    Join Date : Jul 2015
    Posts : 130
    Windows 8.1 Pro
    Thread Starter

    Quote Originally Posted by Josey Wales View Post
    No, you have never turned off your PC? you have never lost power? Anytime I mess with a power supply I remove AC to. I have worked on some huge power supplies and or inverters that backed up a DMS 100 Switch. Nothing will happen to your PC. what is stored is temporary files. I have cleaned my PC about once a month and I never had to remove the PS to do it
    I have turned it off before, but it didn't immediately came to mind that turning off a PC empties the RAM the same way as removing a power supply during a Hybrid Sleep. Wanted to be sure on that.
      My ComputerSystem Spec
  2.    11 Apr 2017 #12
    Join Date : Jul 2015
    Posts : 130
    Windows 8.1 Pro
    Thread Starter

    I have a slightly off-topic question but I noticed something weird.

    Before cleaning up the PC, if I completely shut down the PC, I'd always have to press the Power button several times before the PC finally boots up. It then boots up normally as if nothing happened.
    At first I thought this might be a problem with the PSU but here's the weird part; When I put the PC into Hibernation Mode instead of shutting it down, pressing a key on the keyboard makes the PC boot up immediately, even if I've left the PC for a whole night in Hibernation Mode.

    After cleaning up the PC, the PC boots up immediately even if I shut it down completely.

    Is this still a problem with the PSU or could dust in the PSU (that I've cleaned) really be the cause of these symptoms?
      My ComputerSystem Spec
  3.    11 Apr 2017 #13
    Join Date : Oct 2013
    NW Florida
    Posts : 9,441
    Windows 10 Enterprise and Pro/Windows 7 Enterprise/Linux Mint

    Hi Johnny, first you should always turn the computer off, remove power and drain the capacitors by holding the power button down for several seconds before entering the case to clean it or work on any components.

    Once you restore power, the capacitors have to restore power and supply power to the Motherboard and components before it will start. That usually occurs within a matter of a few seconds. It doesn't hurt anything and will damage nothing.
      My ComputersSystem Spec
  4.    12 Apr 2017 #14
    Join Date : Jul 2015
    Posts : 130
    Windows 8.1 Pro
    Thread Starter

    Quote Originally Posted by essenbe View Post
    Hi Johnny, first you should always turn the computer off, remove power and drain the capacitors by holding the power button down for several seconds before entering the case to clean it or work on any components.

    Once you restore power, the capacitors have to restore power and supply power to the Motherboard and components before it will start. That usually occurs within a matter of a few seconds. It doesn't hurt anything and will damage nothing.
    Thanks for your advice. I indeed always follow this procedure.

    But I have another question. I had a problem for a long time until I cleaned my PC; I had to press the Power button several times before my PC actually booted up. After cleaning the PC, this problem is now gone. My question is if dust could've caused this problem or that it is a problem with my PSU.
      My ComputerSystem Spec
  5.    12 Apr 2017 #15
    Join Date : Oct 2013
    NW Florida
    Posts : 9,441
    Windows 10 Enterprise and Pro/Windows 7 Enterprise/Linux Mint

    I've never had that issue so I'm not sure I can answer. However, I assume it could be possible and if cleaning the PSU solved the problem, it would be reasonable to assume that was in fact the problem.
      My ComputersSystem Spec
  6.    12 Apr 2017 #16
    Join Date : Oct 2013
    Nothern Ohio
    Posts : 494
    Windows 7/64 Professional

    I don't not recommend doing any cleaning or maintenance in a computer with any power to the computer.
    I know of no reason one would try to do such things while the computer is in sleep or hibernation.

    Simple:
    1. Close all programs and things you are working on. Just like you normally would.
    2. Shut down the computer using the 'Shutdown Button' as you normally would.
    3. Unplug the power supply from the wall outlet.
    4. Hold down the tower/case start button for about 30 seconds. A little longer would not hurt any thing.
    5. Ground yourself to the computer case to remove static electricity.
    6. Do your cleaning and put things back together.
    7. Plug the computer back into the wall outlet.
    8. Turn on your computer as you normally would.

    **The big thing is; don't tinker around inside a computer when their is power to it.
    When a computer is in hibernation or sleep of any kind their is power to the computer.**

    Jack
      My ComputerSystem Spec
  7.    12 Apr 2017 #17
    Join Date : Jul 2015
    Posts : 3,694
    10 Pro

    Quote Originally Posted by Layback Bear View Post
    When a computer is in hibernation or sleep of any kind their is power to the computer.
    If you disconnect the power then there is no power irrespective of the state of the PC when you did it.

    If it was shut down, in sleep mode or on the desktop when you reconnect the power and restart it will do a full boot. The last 2 are not advisable as you may lose data and/or get a corrupt system.

    If it was in Hibernate or Hybrid Sleep mode then when you reconnect the power it will restore the contents of RAM from disk and resume where you left off. That's why you can change a laptop battery when it is hibernating for example.

    Having said that I always follow the same steps as you anyway
      My ComputerSystem Spec

 
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