Bad power supply or other?

Probably nothing like what you offered.
Typically, such things are caused by one of the following:
1. computer did not shut down properly at last time;
2. the computer has some settings that have changed for some reason, such as the CMOS/BIOS battery is out of date or the connection is poor (the battery voltage should not be lower than 3.2V when running, check it), to restore default settings remove battary out for about minute, then put it back and check voltage. If it is less than 3.2 V, Your computer may do weird things, also will not remember settings, some functions may not start etc. But basically computer must start and work.
3. may be there was some random problem

 

Check for bad/bulging caps on the mainboard.

And if you have a spare psu, test that one.

 

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I would open the box and wiggle all the power connections one time in fact I would wiggle all the connections , some time as things age vibration from fans or other parts cause a not so good connection , I would do that before spending any time or money trouble shooting !

 

It's been said by others here, so, I'll just reinforce what others have said.

I would recommend changing the CMOS battery no matter what. Then, start looking at the MoBo and the PSU.

 

fastest way is swap out the PSU if u have another...but it could also be a bad mobo....u can find one on ebay real cheap for under $25.00.

 

i would also try that first and see what happens.

 

thanks for your reply a lot of people find answers to problems and don't reply to what the fix was thanks again