I was cleaning out one of my PHAT 40GB PS3s ( 160GB HDD Replaced ) i completely stripped it, cleaned it out right down to the fan blades, and when i put it all back together and powered up the PS3 when i opened up PS3 ITA Manager or MultiMAN it gives me a black screen, it's a black screen on any homebrew i open. I tried to downgrade using the 3.55 DEX downgrader and it got to 80% and said the update had failed to install and was restarting. After it restarts it says "The previous install operation was cancelled. The system is attempting to install again". But it always fails.. Any ideas anyone?