Can using an older Dell power supply affect computer performance at all? I'm not typing this on said computer, so I can't recall the model of the unit. However, I do know that my newly built PC (reused Hard Drive & Power Supply) has been freezing quite frequently while browser use and sometimes gaming. Certain times when I load up Dark Souls, my WHOLE entire computer freezes and crashes, forcing me to hard reboot by pressing the power switch on the motherboard (I'm running it without a case temporarily). I recently ran Windows Memory Diagnostic Tool and it detected no errors. Could the PSU be the problem?