optiplex 320 solid yellow/amber power light

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optiplex 320 solid yellow/amber power light

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This PC is out of warranty, and from what I read, the problems I had of a dying system were either the power supply or the motherboard. Slight possibility of front panel board. I chose to replace the motherboard. It's all put back together the same way now. When I plug in the power cord, the power button lights up and stays orange/yellow/amber and fan does not start, etc. When first replaced motherboard and first started up, I did get a few seconds of fan and some beeps, and then it went down again... NO chance to check beep codes or anything. I have disconnected and reconnected all onboard cables, new battery, reinstalled memory. Power supply? Or throw in towel? Thanks in advance, Emily
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