Shuttle SN68PT PSU problem

[Robert Andrew]

When I try to switch my PC on, nothing happens. I have to disconnect the mains cable, wait for the lights on my USB hub to go out, plug in again - and it starts fine.

The USB lights bit is just a visual cue. The same happens when the hub is not fitted.

Latest BIOS is installed.

It seems to me this is a PSU problem but before I splash out I wondered if anyone else had encountered this problem. It wouldn't be the first time I've had to replace a Shuttle PSU.

Many thanks.

Rob

[watercooled]

THE USB light will go out when the caps in the PSU are discharged. Are you putting the system to standby or shutting it down?

[Robert Andrew]

When system is shut down and I try to restart, it won't. As above, disconnected mains cable from back of case, waited a few seconds, reconnect - and it starts up.

I've been searching other forums and it seems the PSU may be underpowered and a 300W version solves the problem. If that is the case, it's not a good design.

Many thanks for replying.

[watercooled]

Oh I was having a problem with my system resuming from standby which was also solved by pulling the plug, turned out to be a Windows issue which still hasn't been patched! Do you have another PSU you could test with?

[Robert Andrew]

Sorry, no spare PSU.

To cap it all, various suppliers are telling me there is no compatible Shuttle PSU for the now obsolete PC40 (in the PC I have) and the PC50 (which Shuttle say was the PC40 replacement).

They say the PC60 is meant to replace the PC50, but only in certain Shuttle cases - and not the SN68. Hmmm. No more Shuttles for me I think.

[watercooled]

Yeah that's the problem with proprietary form factors, you're relying on the MFR to continue support for replacements/upgrades etc. You could always move everything to a micro-ATX case, I'm not 100% sure but I think everything (apart from the PSU) would be compatible and you could use a standard ATX PSU then.

[CAT-THE-FIFTH]

The PC40 uses standard ATX connectors so any 1U PSU with the same dimensions should work in theory as long as they have split ATX power connectors. I have used the PC40 to power up a mini ITX motherboard so any similar PSU should be able to power up the Shuttle motherboard in your system IMHO.

Here are the dimensions of the PC40:

http://global.shuttle.com/product_de...pec.jsp?PI=428

These units should work AFAIK:

http://linitx.com/viewproduct.php?prodid=12301

http://linitx.com/viewproduct.php?prodid=12538

They both have 20 pin and 4 pin ATX power connectors.

In theory the PC60 should also work fine as long as it has the same ATX power connectors as the PC40.