Using 23" Cinema Display and VGA to DVI adapter??

I have 4 computers (2 deskop PCs, 1 IBM thinkpad laptop and 1 MAC). I have a DVI switcher. 3 of my PCs work great. My IBM thinkpad (T23) has an old style DVI connector on it that I cannot use (I thought I could until I got the Apple Monitor). I have tried a passive (no power) VGA to DVI adapter...but the monitor just ignores the signal. Do I need to purchase a $299 powered VGA to DVI adapter? I was thinking of looking for a PCMCIA (PC Card) video card with DVI out for my laptop, but havn't found anything when searching via google. Any information would be helpful. Thank you!
PowerMac G5   Mac OS X (10.4.5)   23" cinema display

The VGA to DVI adapter sounds like it's just an adapter that re-routes the pins to make the cables connect. The DVI connector can carry both analog and digital signals, so all the adapter would do is make a VGA cable with its analog signal go into a DVI cable that still carries the same analog signal. If that's the case, it won't work with the Apple display since the Apple display doesn't accept an analog VGA input even if you get the cables and adapters to hook it up. So yes, you would need the expensive VGA to DVI "converter" rather than just an "adapter".

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