|Sure, the PSU was included with the case.|
Although the details on it are patchy. It says on the unit
atx p4 power supply
DC output: +5v +12v -5v -12v +3.3v +5vsb Total
KY-ATX500: 32A 14A 0.5A 0.8A 28A 2A 500W
The other PSU i tested it with was as follows
COLORSit atx12vp4 switching power supply
AC INPUT:230VAC 10A 50-60Hz
+3.3v +5V +12V -5V -12V +5VSB
28A 35A 30A 0.5A 0.8A 2.5A
Regarding the HDD choice I was unaware that the HDD was unsuitably slow, but it's good to know so thank you.
The system went through memtest86 with no errors
Other than the boot sequence the bios is set to defaults, win7 is untweaked and protected with Avast.
I hope this helps clarify the problem, thank you for you're contribution!