Ok what I did inside my case was basically checked all plugs were in correct slot and I re did the FPanel wires because I thought that was where the issue must lie. And what I meant when I said windows 7 was shutting down, was that it displays the shutting down page after I select shutdown from the start menu, or when I press my power button, but then my signal to my monitor is lost and my pc carrys on running. Unresponsive to anything I do, including holding down my power button. So I have to flick the switch on my psu to turn it off.
Thanks for all of the help guys I will try checking the power management settings when I get home from work this evening.
I would rather not do a fresh install of windows but if I cannot sus this out soon I will, it is starting to seem like a software issue after all.
Thanks again for the help guys, cheers.