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New psu for Shuttle XPC SB81P won't work!

Got a new power supply for Shuttle sb81p. Will not power up! Upgraded from the 350 to the 450. Plug it all in, and it's just dead........any suggestions would be appreciated.

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  • MissKaren92 Dec 29, 2007

    The PSU definitely works, but the fan spins only for a second when we switch the power switch on the back of the computer; then it's dead again.

    If anyone can give a breakdown of what connects to what just to make sure we have it connected correctly, it would be greatly appreciated.

    We are replacing a 350 with a 450 ps55 upgrade kit.

    Thanks so much for your help.

  • onebuffchink Feb 26, 2009

    I have a similar problem with my SB81P except I can start it by pressing the reset button. Not sure if a power supply problem or motherboard problem. Any solution?

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Try these:

Remove the PSU from the case.
Plug it to power.
Turn it on
Using a paper clip, short circuit the green wire pin with the the black wire pin on the 24 pins connector.
If the PSU fan start, remove the clip. The fan should keep spinning. That means that the PSU is working.

If the PSU is working, then the power up pins on the mother board might not be shortcircuited by the front panel switch.

Connect the PSU to the motherboard and to the power, turn it on. On the motherboard, locate the power up pins and short circuit them with the paper clip. If the computer powers up then there is a problem with the power on switch.

If the PSU does not start at all, return it.
If you can't return it, unplug from power, open it (warrenty voids!) and look for a fuse that looks like a one inch glass tube with metal caps. inside should be a wire. If the wire is broken, buy a new fuse in Radio Shack.

Hope that helps.

Posted on Dec 28, 2007

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