Mmm. Only exporting those specific events keeps me from seeing the context but I think I got what I need...
The "good" news is you are right to suspect your PSU. Sudden powerloss is absolutely a strong candidate for causing an event 41 with a code 0.
Unfortunately, it doesn't completely rule out a thermal trip (but those usually get recorded). If your motherboard came with any software for temperature monitoring, I would use that just to be safe. Also, if you're overclocking or if you tweaked the voltage on your RAM or anything like that--set all that back to default and test.
Now, before you buy a replacement PSU... decent PC repair shops should have testing equipment for PSUs specifically, so it might be worth unhooking it and bringing your current PSU to one of them. Or, if the watt rating is low, it may simply be underpowered (which would match your symptoms).
So, those are some things to check and try... Hope that helps ^^