Displayport and usb

Hi, I'm planning to buy displayport or/and usb adapter/conventer between my macbook pro and LCD monitor(s). If I plug displayport/dvi or hmdi between LCD monitor AND plug usb conveter vga/dvi to other old monitor. I already use my mouse in my one of two usb. Will they affect/damage my mac? If yes, I'll only use displayport to dvi LCD. (no hmdi) And will plan to buy the new LCD monitor with hmdi and dvi.
My mac displayport/dvi to LCD monitor
                                                                > at same time. Damage? or won't work? for my mac.
My mac (other) ubs/vga to old monitor
Thanks in advance.

I have been using the display for several years, connected to my G4 PPC Mac Pro. Now that I have a new MacBook Pro, I was thinking of getting rid of the tower and simply using the laptop.
The cord coming out of the back of the display is connected to the tower with both the DVI plug and two USB plugs. It didn't occur to me to look on that cord because my understanding was that there was a port on the display itself, and I always think of that cord as simply a power cord.
I understand getting a DVI-to-Mini DisplayPort converter cable, but the Cinema Display is apparently powered by the Mac Pro tower. Would a laptop be able to power the Cinema Display? And would I have to connect both USB plugs to the laptop? That would take up both of the MacBook Pro's USB ports.

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