Yup. Walked in on my PC being unresponsive with a black screen and no power going to USB so I had to switch the power supply on and off to get it to reboot. I walked in on this at 8:45 and according What do I need to look at next? 
oh god, not again....
My reaction exactly...
I'm using the "High Performance" profile and I don't know what ACPI is. It is set to whatever default is because I reset my bios when I replaced the cmos battery. I'm kinda pissed because now I know I possibly wasted $60 on a new PSU and it's too late now because my old one is already in the trash and long gone.
Do you leave your PC on overnight? You mentioned you had been having some storms lately didn't you?
Yes.
Yes but the storms stopped overnight and according to event viewer this happened at 8:40 AM and I walked in on it at 8:45 AM after I woke up this morning.
Can't do that. I have to have it always powered on because the whole family uses it now too. I also gave them instructions on how to reboot the PC in case this happens while I'm at school, which it did in the past.
OK... why can't it be turned it off at night whilst presumably nobody is using it?
Wow. I can't believe I didn't think of that a long time ago. Will do!
If the reason you were leaving it on for them was so that you didn't need to enter a password for them or you didn't want them seeing your files or something then this is the solution.
They can turn it on when you need it, log into their account, use it and then shut down afterwards.
It'll go weeks at a time without shutting down and it was never powered off until the thing happened this morning. I mean before I replaced the PSU it happened daily but now it's only happened once a week later so I must be getting something right.If the reason you were leaving it on for them was so that you didn't need to enter a password for them or you didn't want them seeing your files or something then this is the solution.
I'd be interested to see if the PC can manage a day with no shut downs though. Turn it on when you get up, leave it on all day, turn it off at night. No reason to have it on at night.
I'll try that thanks
Ok. Now, do you have a guess of what else could be causing KERNEL POWER EVENT 41?
Motherboard shorting? It just sounds like the system lost power unexpectedly so yeah motherboard short could be it. That's why I recommend making sure you have the correct number of brass standoffs installed and also making sure that they are in the correct places.
So you're telling me all these years and hundreds of dollars in repairs between me and the previous owner and it could've just been a loose screw?! If that end up being the case I'm going to be so pissed...... but I'll probably get a good laugh too...
Well I think your old power supply was bad so a new one was a good investment. You've had your new one for a few days now and it's been fine until this incident. I'd be tempted to check the motherboard and make sure it isn't shorting (if memory serves me correctly I may have advised you did this 2 years ago when you joined but I don't think you were up to it). Reinstalling Windows sounds like a good idea too. It would be interesting to see how many issues you get after you've rebuilt it and checked it's all OK and once you have a new installation of Windows on it. I'd take this opportunity to install Windows onto your SSD and games onto the HDD too, make sure whilst you are installing Windows you only have the SSD plugged in and also ensure the SATA mode is set to AHCI in the BIOS.
