Help! PicoPSU 105-XT, no graphics output from 4550

benc · Post by **benc** » Wed Apr 21, 2010 11:27 am

Hello - My old PSU just failed and I've replaced it with a PicoPSU 150-XT. Other components:
MB: AOpen i945Gmm-HL
Video: Radeon 4550

The system boots fine (I can connect via RDP), but there is zero output from DVI port on the 4550 at any time. I've also tried the IGP, but there is no output from this either. I suspect the IGP needs me to put some jumpers back on the motherboard before it'll work. I will give this a try later on.

Is it possible that the 4550 isn't getting enough power?

ilovejedd · Post by **ilovejedd** » Wed Apr 21, 2010 11:29 am

Have you considered if it's the monitor with the problem? Or maybe the cable?

benc · Post by **benc** » Wed Apr 21, 2010 11:33 am

The monitor (TV) was working fine before the PSU died. Actually something I've just noticed is when I unplug the DVI cable from the PC the TV says "Check signal cable". When I plug it in it says "No signal".

I'm confident both the monitor and cable are 100%.

benc · Post by **benc** » Wed Apr 21, 2010 12:05 pm

OK - I've put the jumpers back on the mobo and the IGP now works. I can't understand why the PCI express x 16 card isn't working though.

I've finally tested the PCI-Express x 16 4550 card again and it doesn't work. I wonder if the PSU took out the 4550 when it died?

xan_user · Post by **xan_user** » Wed Apr 21, 2010 12:30 pm

how many watts is the brick?
what other components are in the system?

fwiw- ati recommends 300 watt psu

ilovejedd · Post by **ilovejedd** » Wed Apr 21, 2010 1:12 pm

xan_user wrote:fwiw- ati recommends 300 watt psu

The TDP of the HD4550 is just 20W, I believe. They recommend a 300W PSU to cover their behinds. You can usually ignore those warnings assuming you know what you're doing.

Question, do you have another power supply handy or another computer where you might be able to plug in that HD4550 for testing?

benc · Post by **benc** » Wed Apr 21, 2010 11:50 pm

No, I only have one desktop PC and the old PSU died. I know the 4550 only draws 15W of power as when I originally installed it the overall consumption rose from 45W to 60W.

benc · Post by **benc** » Thu Apr 22, 2010 12:53 am

Aha - I've found the problem. It looks like the PSU took out the graphics card (or vice versa I guess?) as I've tried the 4550 in my work PC and there's no output.