Used a multimeter to check the voltages out of the PSU, using a paperclip to power it on, not plugged into any components. Voltages all matched the on the box stamp. While the computer was posted I only managed to check the 12V before it died on me. Out of an unused connector of the PSU the 12V matched 12V.
Have not been able to reset my BIOS, computer shuts down before I get anywhere and I can't see to find a Hardware switch for it.