Power Supply/Video on/off problem

I too have a Gateway 610xl with video problems - flicking on/off when ever it seems the hard disk drive is accessed (draw on power supply?). Just recently I replaced the power supply with ver 01 but to no avail - the problem continues. My next options are 1) to try to connect an external monitor (as suggested earlier on FixYa), 2) replace video components with parts from Skyline Engineering, 3) try to reduce the load on the power supply (disconnect sound?) 4) try an external much larger power supply, 5)send it to Gateway for repair, 6) get a new system. Any ideas and suggestions would be appreciated.