That's strange, can't say i've experienced that myself before, how do you know the PSU is the issue?
I assume you've tried holding the power button, or unplugging/replugging the power? I have had machines refuse to wake from sleep, appearing completely dead until i forcibly shut it down and then start it again
I've also had issues with power saving features, but i doubt it would be able to overload the powersupply, especially on a laptop
I have a bunch hardware that's probably 15+ years at this point, it's been running for a few years and the only hardware failure i've had so far was a mechanical harddrive wearing out
They ask you to stow the tray if something happens because the microphone is on the underside of the tray and hears you better that way