Just bought a new monitor, a Hewlett Packard LP2475w 24" widescreen 1920 x 1200 resolution. It seems to work just fine as a second monitor to my MacBook Pro via the mini display port but absolutely no joy with the old PowerMac.

The PowerMac is a dual 800Mhz quicksilver model with an NVidia GeForce 2 MX with twinview and 64 Mb of SD ram. It has an ADC port and a VGA port.

I've tried using the VGA port and the monitor can't detect a signal. Can't use the ADC port without some kind of adapter, should I get one and if so, where from.

Could it be a driver issue with the graphics card, if so I can't seem to find any updates apart from those that handle Apple display compatibility. Or, more worryingly, does the graphics card not support the monitor?

Please help