I am looking at at Dell Optiplex GX150 that I was told would just randomly shut off while in use. When I started to look at it I was able to get it to boot and get to Windows desktop. I shut down the machine to look at the internal configuration, since then I haven't been able to get the machine to do anything. When the power button is pressed certain items internally can be heard starting, but the power light stays a solid amber color and the monitor has nothing displayed. I think the power supply might have just finally crapped out on it, just seeing if anyone had any other ideas.
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The moment I began reading your post I thought PSU. Looks like you need to replace it to me. Be careful as some of the older Optiplex pc's had PSU's that were wired differently to the norm. If you should need it, I have all the wiring info to allow …
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If the mobo has the socket for the 4 pin then it is undoubtedly needed.
Can you take and post a photo of the psu plug as it is at the mo?
I will just add that psu's are my particular specialty.
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