Nevermind Outlander. It seems that you were correct. I used the screwdriver to try that and it does seem to be the problem with it starting by itself.
Though I have to ask. Could this also be the cause for my computer to be shutting down by itself without any real reason to do so?
I think its likely to be the cause of your earlier problem too. It may even have been one of the reasons your old psu failed . But Im not sure how that would happen .
Im glad you found the problem