Same bloody computer. Same model :-) . I kept it in my room for a couple of months, after i changed with newer. So basically all should have worked perfectly once powered.

Before 2 days came my Galil board. So i wanted to test it. Nightmare! Mach3 not working, then windows stopped working, then graphic card stopped working, bought "new" card from boot sale for 5 euro, cleaned everything inside with contact cleaner, dried it with a hair drier, kicked it 2 times and now works perfectly. As my friend used to say-never power off the computer. Its cheaper and less troublesome.