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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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Re: New psu for Shuttle XPC SB81P won't work!

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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Shuttle has been working fine for about 4 years. Then it would be slow coming on, maybe boot up 20 mins after pressing the on button. Eventually refused to come on at all. I replaced the power supply and...

Change your BIOS battery.
I have an old Shuttle XPC sn41g2. It's been running almost constantly since it was new. About a year ago it started to be difficult, it was difficult to start and sometimes I had to try several times before it started. At the end I had to disconnect and reconnect the mains supply everytime i had to reboot the PC. Then one day I discovered that the prosessor was running at the lowest standard frequency so I went to the BIOS to set it right, did so and rebooted, and the prosessor stil wouldn't run right. After some thought I changed the BIOS battery, went to the BIOS, resat all settings, then it rebooted normally and since it has been running like new.

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It don't start up, it means not light, no fan's no nothing

try a different kettle lead...

then try powering up with the motherboard disconnected...

if still no dice then new psu....

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Takes up to 30 mins to turn it self on

I had the same problem with 2 of these systems.
You need to replace the power supply.
I know it's a weird problem. It seems like it shouldn't start at all.
But it solved the problem with both of the systems.

here is a link for the power supply at a few stores:

Hope this helps.


Oct 20, 2008 | Shuttle XPC SN41G2 (XPC-SN41G2-SHUT) PC...

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