Solved: HP media Center M7100Y won't start

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stevesmith

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This HP media Center M7100Y won't start (no Power). The power switch checked out OK. I removed and checked the PS by jumping pin 16 PS_ON to pin 15 Com - the fan runs, green light turns bright and all voltages check out OK. When I re-installed the PS and press the power button it does not turn on (Green light dim and no fan). I reconnected the PS with the jumper in place and it still does not turn on but if I unplug the 24 pin connector with the jumper in place the PS turns on and voltages are all OK? What components of the motherboard tells the PS to turn on (I expected the jumper to turn it on). Any suggestions? Thanks.
FYI I did not connect any of the power output plugs to the DVD, CD, hard drive etc. I connected the 12V plug to the motherboard with no change, connected power to the hard drive again no change - power supply would turn on unless I unplugged the 24 pin connector with the jumper in place.
 

Oddba11

Jim
It's My Birthday!
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May 12, 2011
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8,336
The front panel power switch triggers a power circuit on the motherboard, which triggers the power supply to turn on. Sounds like it's time for a new motherboard.

Also, while the jumper trick often confirms a power is operational, that is not always true. Especially in regards to hardware with high power requirements. The best way to eliminate the power supply as the fault, is to swap it out with a known good unit.
 

stevesmith

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Apr 6, 2009
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29
Thanks for the feedback. I figured the power button triggered a circuit - just didn't know where to look. Unfortunately, I don't have another power supply to try. I don't know if he wants to purchase a new one on the chance it doesn't work.

I was curious about the jumper - since it worked with the PS disconnected but not when the 24 pin plug was plugged in (none of the other power connectors were connected - then tried connecting just the 4 pin 24v connections and no change). Like something (maybe a short or safety circuit) was preventing the jumper from turning the PS on???

It may just be time to replace the PC - it's 2005 model but I like the challenge of troubleshooting before I give up.
Again - thanks for you feedback.
 

stevesmith

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Apr 6, 2009
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29
decided to scrap the PC - not worth the money or time. Thanks for the responses. Sorry
 
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