Question about Dell PowerEdge 1800 Server
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.
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.
Posted on Feb 13, 2009
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