could be a bad power supply or any number of other issues. most likely, unless you have a good electronics repair background, you ain't gonna fix it yourself. i doubt it is a fuse, as that would not cause the slow on condition it had. though the cause of teh slow on could result in a blown fuse.

i think you need to find an authorized repair center close by you. if the unit is still under warranty, call Phillips.

One last thing you can try: Unplug the power cord for 3-4 minutes. I know you tried the unplug, but sometimes the power supply capacitors need time to discharge to truly reset the CPU based controls...