Problems conncecting my 20" cinema display (Previous Version) to a PC

Problem description:
Originally, a 23" cinema display (Previous version as well) was connected to my PC via DVI to ADC adapter. This morning, I tried to connect the 20"(Previous Version) to the same PC, it wouldn't power itself up~~~ After turned the PC off, and switched back to the 23", I turned on the PC, everything worked just fine again. While everything was still up and running, I unconnected the 23", and hooked the 20" into the adapter, now the 20" started to work.
This is a really weird problem to have and PLEASE PLEASE help me with this. Thank you guys SO SO SO much!

I'm using a FX5500 low profile PCI card installed in the docking station for my IBM T23.
This is just weird~ 23" works fine but not the 20"……

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