Computer Wont turn on

By blim10 ยท 9 replies
Jan 18, 2008
  1. Hi I have a HP m640n series computer and today i went to turn it on but when i pressed the button nothing happened. I noticed that the green light on the back of the power supply that is usually turned on when it is plugged in was not lit up. I figured that i need a new psu. Does anyone else know anything else that cuold be wrong with my computer?
  2. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

    The power cord can become lose from the computer, on PC's it has to be pushed in really hard. Also confirm the plug in the wall is OK (plus confirm that outlet is working too - ie switchboard relay may be off)
  3. mailpup

    mailpup TS Special Forces Posts: 7,182   +469

    Don't take this the wrong way but just to check the obvious, if it is connected to a surge protector, it didn't get switched off by accident did it?
  4. blim10

    blim10 TS Rookie Topic Starter Posts: 34

    i already checked a few different power outlets in my house and the powerbar its connected to is turned on, i'm also sure that its plugged properly into the computer.
  5. kimsland

    kimsland Ex-TechSpotter Posts: 14,523


    This has worked before

    1. Remove the power cord
    2. Hold the power button on the PC in for 30 secs (dispersing all voltage)
    3. Let go of the button
    4. Plug the power cord back in (securely !)
    5. Turn on the computer again

    If that didn't work, I'd have to agree Power Supply
  6. blim10

    blim10 TS Rookie Topic Starter Posts: 34

    That didn't work. I also tried the power cord in another pc and it worked. I am probably going to order a replacement psu from HP. Is there somewhere else that I can get a bigger psu that is still compatible with my motherboard?
  7. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

    Yes (and better)
    But actually your system HP m640n can you just re-confirm that, or find it on the HP site - support - start detection (to confirm type)
  8. blim10

    blim10 TS Rookie Topic Starter Posts: 34

    whoops its the HP m7640n media center Pc
  9. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

    One last option !

    You will need to open the case (hardware experience required and safety precautions from manual must be understood)
    Power cord out !
    Remove cover
    Re-connect all power cables internally, especially to the motherboard
    Also actually smell the power supply, for that electronic burnt out smell
    Try again

    Otherwise any computer shop can sell you a power supply, I recommend min 450Watt
  10. blim10

    blim10 TS Rookie Topic Starter Posts: 34

    ok, thanks for the help
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