Having problems with your Dell PowerEdge 1800 Server ?

Concise Question, Poweredge 1800 powerup failure

\015 Hi: I asked earlier, but my info was not well thought out. I thought best to try again.1)On occasion when I power on, the case fan turns on, and a yellow wire output line from power shows 12V for maybe 5 seconds or less. Then the voltage drops to nearly nothing, and the orange light starts to blinks on the server. It never shows anything on the video screen.2) If I try it again soon after, while the case fan never turns on, the voltage shows nearly nothing. The power supply fan does run though.3) However If I wait awhile to try it again (maybe an hour) it will again do what it did in (1) above.I did try running it, disconnecting all drives and the fans one by one. This did not help (I was looking for a short).To me, this smells of a bad power supply. But expensive to guess. Any feelings on this? Thanks. Sorry for bad question before, I was not being clear.\015

Answers :

It is definitely the PSU that's not working properly,because defective motherboard should still receive the 12V. you can use a desktop standard power supply to check if the server runs fine, even a cheap one is ok for a test run. they sell also cheap (about 15-20$) PSU tester, definitely worth when working with servers and WS.
the Power supply fan might have a dedicated rail coming from the thermal sensor(thermistor.)this is why it can run even with bad 12V rail.
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