In short, (at one of my customers house) with nothing plugged into the tower, except the power cable, the computer powers on briefly and shuts itselft back off. HOWEVER, when the computer is back in my shop it runs perfectly normal. I even let it go overnight and it never shut off.
It's not her outlet (we don't think) because she took it to another outlet on another wall with the same results.
What else is there??
In detail -
Customer brought in pc with it immediately powering off
Found that with NO hard drive plugged in, computer would power normally. (Plus the drive would not mount externally)
Replaced hard drive and reloaded - everything powers normally, everything works normally IN MY SHOP. (and blew out the dust)
She goes home, and uses the computer for about 30-45 mins and it shut off on her. Not an auto reboot but shuts off.
She tries to power back on - it comes on for a few seconds and shuts back off - it does this every single time.
She calls us - we instruct her to unhook all extra components - no change
She plugs directly into the outlet (without power strip) - no change
She brings back - it works normal in our shop - and ran overnight without problems (and had several programs going so it was not just idle)
Motherboard capaciters are good, and the usb ports are good (so to not short the computer)
She comes to pickup and we send her with a new power chord -
She calls - same thing with the new power chord & plugged into directly the outlet
She unhooks hard drive - no change
She moves to another outlet on another wall - no change
I'm at a loss. The only difference between my shop and her house would be the outlets and she's getting same results on each outlet on what we assume are different circuits.
I was told maybe the power supply but if it was that, wouldn't I have the same issue in my shop?
Any help would be greatly appreciated.