Don't know what your electronics skills are like, but if you don't mind getting your hands dirty its worth taking a look at the videos by RetroGameModz on youtube, he's done a couple of 4000 and 1200 videos covering video faults I think. Knowing the 4000 and 1200 it's most likey the surface mounted capacitors. Take a close look at your motherboard and look around the capacitor cans for any signs of leakage - if you see anything that looks like leakage that cap will 100% need replacement.
