I have read numerous threads before posting one of my own. Could not locate exactly my symptoms.
I have Dell Inspiron 530 with Vista. I came home last night to a solid amber light on the front panel. During this time I suspect that I had some Dell automatic updates get installed. They have been waiting for days now, but I kept putting off allowing them to update; so at some point they updated on their own. Anyways, I kept hitting the power button until finally the machine booted. I have not seen the solid amber light for some hours now. The machine is booting as normal, but for no reason that I can see, it will just power down and back up and go through the normal boot. It may go along for hours and then suddenly power down and back up. I read things to make me think it could be the PSU, MoBo, Graphic card, etc. Any help or hints would be much appreciated. Thanks