HP 9845 C with 280 option startup failure

Then you probably got what is called "option 270" with something like a total of 318 kbytes plus 512 kbytes memory extension. If you're interested, I think you can check in one of the 9845 specification brochures from www.hpmuseum.org. Internally your machine should be completely identical to mine, except one or two ROMs which are special for the color monitor, even the RAM expansion probably is the same (98407A). What I'm really interested in: The model 200 versions have a new power supply unit, no voltage check points any more, but a 4 LED indicator (and twice the number of electrolytic capacitors inside). Those LEDs flash in a special pattern sequence during power-up, and then stay all on (I actually don't know whether this indicates success or failure). The power supply unit in the monitor has a similar LED indicator, after finishing power-up, only the rightmost LED is on, which indicates success (at least that's what the manual says). How is it in your system? Not that easy, d'accor. --Ansgar