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No POST

HP EliteDesk 800 G1
Microsoft Windows 10 (64-bit)

I bought this HP EliteDesk 800 G1 and the machine won't start. I am getting a beep code (4 short). I tried re-sitting the memory and have changed the hard disk and it still won't boot or even go into POST. I am following the HP EliteDesk disassemle instructions and have noticed that it does not have a Hood Sense cable nor the device to sense the hood on. Could this be the source of the problem?

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ve tried sourcing the part. It looks like the serial number is 638816-001  I am wondering if I can just short the two pins on the motherboard or would this not be advisable?

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Amazon has one at US$81 plus $85.10 shipping which I find a bit much.

https://www.amazon.com/HP-638816-001-Hood-sensor-module/dp/B008H66C9C?keywords=HP+638816-001&qid=153...

Robert

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