Apple17 inch/power light always on/start up problem

My cat peed on my display. All worked well but now the power/sleep light on the display never goes off. Whenever I try to start up I get open firmware screen and have to type in Mac-boot and all works fine . But when I try to start up, everything blinks then I get the open firmware screen. When I disconnect the display from the tower the computer will turn on but when I plug in the display it will not turn on. Eventually I get everything going. I guess the question is since the display seems damaged will that cause this open firmware problem since the display light is always on? I feel so just wondering what everyone thinks. Did reset pram , no help.

Thanks for your help.
Tried charging the battery last night, but no luck there.
Tried resetting the PMU and initially this worked. The mac started up fine.
Unfortunately it bombed out before I could copy any files across though.
It now doesn't even get to the start-up screen before bombing out.
You hear the chime (usually), but then the screen goes, if it turns on at all.
I've tried PRAM, and holding shift down, but it doesn't seem to get far enough for these to kick in.
I've had problems with the USB ports over the last few months.
I thought this was unrelated, but from what I can read it could be the motherboard playing up, and if so it would account for both of these things happening.
Thanks for your help though, I really appreciate it.

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