theres only 4 slots, dc in, dvi d (metal plate blanking this), d-sub( which im using atm) and line in( which im guessing is for headphones etc as it looks to be a 3.5 mm port. Was all working fine last night, and now just nothing! if i take the 3 pin lead from the power supply block and push it back in theres a quick flash on the screen then nothing . . .?