Computer Turns On Then Off.

Hi, i got a system that was abput to be thrown away, i was told it had problems, but it's a really well specced system for free. So, first off, i'll give you my specs then explain the problem:

AMD Phenom x2 555 @3.2GHz
Asrock 770 Extreme 3.
4GB DDR3 ram (Known to be working)
450W aopen power supply, this is a heavy duty power supply and weighs a ton!

My problem:

I turn on the computer, hard drive spins up, lights come on, but after around 5 seconds, the computer will turn off and i have to open the case, take off the 24pin connector and put it back on to get any response from the system.

I can get it on, but only rarely, i have a fiddle around with the jumpers on the motherboard, sometimes it starts, most of the time it will not, but when it's on, it's rock stable and has no issues, you just can't turn it off.

Any Ideas?

Cheers!
7 answers Last reply
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  1. sell the motherboard for parts and/or trash it and that power supply.
    one try is too clear CMOS and pulling battery on motherboard.
    try a new power supply.

    then (once it doesn't work and you trash it) take the RAM and the processor (X2 555) and set yourself up a HTPC unit.
  2. thomasd221 said:
    450W aopen power supply, this is a heavy duty power supply and weighs a ton!

    While it is easy and mostly logical to believe that weight = quality, some unscrupulous no-name Asian PSU manufacturers actually have FAKE transformers made of concrete to add weight and trick people into thinking the PSU is of better quality than it really is.

    I'm not saying that your specific AOpen PSU is one such unit but it is known to happen.
    http://www.hardwaresecrets.com/blog/Hantol-PSU-Fake-PFC-Made-of-Cement/220
  3. try it with a new power supply and then if it doesn't work the motherboard is trashed.
    probably blown from the power supply in the first place.
  4. proffet said:
    try it with a new power supply and then if it doesn't work the motherboard is trashed.
    probably blown from the power supply in the first place.


    How can the motherboard be fried if it turns on sometimes? I can't find a diagram of where the jumpers should be, do you know where it could be?
  5. thomasd221 said:
    How can the motherboard be fried if it turns on sometimes? I can't find a diagram of where the jumpers should be, do you know where it could be?

    that's right and you did say that you have had it stable before.?
    I got this and another thread confused.
    my apologies.
  6. proffet said:
    that's right and you did say that you have had it stable before.?
    I got this and another thread confused.
    my apologies.


    It's fine, thanks for the manual too. Will try it tomorrow.
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