no power

Discussion in 'Power Supplies and UPS's' started by trebor, Jan 22, 2007.

  1. trebor

    trebor Geek Trainee

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    have desktop pc wont turn on have put new psu in still dead have checked power cord ok, all internal connections checked and double checked please suggest other possible problems think may be motherboard is it possible to test before replace.
     
  2. RHochstenbach

    RHochstenbach Administrator Staff Member

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    Try to disconnect front USB, front audio, harddrives, cd/dvd drives. Then you can see what might causes the problem.
     
  3. donkey42

    donkey42 plank

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    disconnect all non essential components, try booting with only CPU, RAM, Grafx & PSU, then try to boot, then add 1 component at a time (making sure you can boot each time) when it does not boot that part could be faulty
     
  4. RHochstenbach

    RHochstenbach Administrator Staff Member

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    I had the same problem about 2 months ago. In my case it was caused by the front USB connector.
     
  5. trebor

    trebor Geek Trainee

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    have disconected all non essential components tried to boot up still nothing:(
     
  6. RHochstenbach

    RHochstenbach Administrator Staff Member

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    What motherboard, CPU and RAM do you have?
     
  7. trebor

    trebor Geek Trainee

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    have tri gem 845gl (imperial) 2.60ghz intel celeron 256ram i think
     
  8. RHochstenbach

    RHochstenbach Administrator Staff Member

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    Did you also connect the 4-pin power connector? (is located somewhere near the CPU area). I mean this thing:
     

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  9. trebor

    trebor Geek Trainee

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    yes it is still connected
     
  10. RHochstenbach

    RHochstenbach Administrator Staff Member

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    Did you also connect the cables of the front panel in the correct way on the motherboard? (power / reset switch)
     
  11. trebor

    trebor Geek Trainee

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    any ohter ideas that might help please
     
  12. trebor

    trebor Geek Trainee

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    yes i think so
     
  13. trebor

    trebor Geek Trainee

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    when i plug the power cord in the cpu fan spins for a second then stops
     
  14. RHochstenbach

    RHochstenbach Administrator Staff Member

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    ow then I see. Did you apply thermal paste on the CPU?
     
  15. trebor

    trebor Geek Trainee

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    why would i apply thermal paste to the cpu
     
  16. RHochstenbach

    RHochstenbach Administrator Staff Member

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    You would need thermal paste to guide the heat from the CPU away into the heatsink. Without it, the system will stop. You can find an article about it HERE
     
  17. trebor

    trebor Geek Trainee

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    but i have not done anything to the cpu all i have done is installed a new psu because i thought that was the reason the system would not start
     
  18. RHochstenbach

    RHochstenbach Administrator Staff Member

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    You'll need to do it if you have installed a CPU. Everyone needs to do that. This paste comes together with your CPU cooler. Install the CPU, put the paste on it (as a thin layer), and then put the cooler on it.
     
  19. trebor

    trebor Geek Trainee

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    I have not installed a cpu i have put a new power supply unit in
     
  20. donkey42

    donkey42 plank

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    what is the make & model of your PSU ?
     

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