Desktop Hardware and Upgrade Questions

[EDIT: pasted in the resolution below]

Older HP Touchsmart (600-1000T) has developed a power supply issue. Random, complete power shutdowns that do not seem to align with temperature, cord, or OS status. Un/re-plugging it one or multiple times works, but only until the next outage (moments, hours, days or weeks later).

Our Touchsmart has been prone to random-seeming power outages. It’s a complete outage, as if someone knocked the cord out.

I don’t think it’s related to temperature. It’s wall-mounted in a clean household environment with plenty of ventilation. There is no dust clogging the vents. It can run for days or weeks without an issue, then fail repeatedly within a short time-frame, only to finally stabilize and stay on for long stretches. It sometimes fails once or twice and then runs fine for a long time.

I don’t think it’s a problem with the cord or the outlet. The cord rests on a shelf (and has done so for years), so it seems unlikely it be a break in the wire that’s causing the problem. Further, restarting can be done by either un/re-plugging it directly from the wall (leaving the ‘brick’ alone) or from where the main wall-cable enters the brick. That is, in either case, either the wall plug or the brick side of things are completely stationary when un/re-plugging.

I don’t think it’s an OS issue. Though by nature the outages mostly happen when it’s up and running (Win7), it often blinks out during POST, well before the OS starts to load.

I’m not sure where to look next. Suggestions?

Thanks,

Rhythm

EDIT: SOLUTION

Users iomare and Grzwacz below suggested to look at the power adapter; they were right. 

I kept an eye on the LED on the brick part of the power adapter; it went out when the computer was down.

I picked up a $30 Pwr+ adapter (ASIN B004WDKRE0) and the issue never returned.

The Pwr+ adapter has an LED too, and neither it nor the computer has shut down since I replaced it.

Thanks!