CompuServe Messages

Already did what you suggest…. measured voltages before and during hard disk activity. The 5 volt supply only drops 0.08 volts…. but the 12 volt goes down 0.2 volts or more. This 12 volt supply is marginal (in my opinion) even under no load – other than the motherboard. It reads 11.6 volts DC. A good regulated power supply should have an error of 0.05 percent – or better. My supplier is sending me another Amiga 4000 power supply unit, and I will try out. If that fails will try an external good PC Pwr. supply, which usually are hefty and accurate units. Commodore must have had a rotten sub-contractor for the power supplies. Had the same dismal performance with our 2000 – and a replacement unit of 300 watts capacity cleared the problem. Keep your fingers crossed…. and pray a little! All the best, Hilary.