I changed my system recently but left my old psu 400w, its about 8-10 years old so i probably need to replace it, my pc's been switching off and freezing in high load/playing games so im guessing theres not enough power as iv tried 2 hdd and same thing happens,
As I see, can't get over even 200 watts. Buy a 400 watts PSU, but a good one. Although I don't see a reason for system freeze if the PSU dies, you may have some problems with your processor or HDD. But, anyways, maybe your PSU can't give as many power as your system needs if we see that it's 8-10 years old. But you don't need a 500 watts PSU, as I said, 400 watts is fully enough, even if you want to upgrade the RAM or the VGA or add some HDDs.