Dimension 4400 Won't Boot Up

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I have a Dimension 4400 that has been working great. I have not added anything new that would cause this problem. If I start it in the morning all is fine. When I go to shutdown it hangs up. The monitor will go out and the light on the front of the tower will change to orange. Actually it acts like it is going to standby. I have to hold the power button or unplug it. One time when I tried to start it the Dell logo comes on then goes off over and over again. When this all happens the diagnostics lights blink in random patterns. If I let the computer sit for a while it boots up fine, but still has a shutdown issue. Any help would be appreciated.

Thanks,
Joe
 
Hello! Welcome to TechSpot!

Have you checked with the Dell support website?
Sounds like maybe a fualty psu.
 
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