Screen wont boot on start up

I get chimes,on button lit, fan motors, but no display. Ive changed monitors with a Known good one, tried to reset PRAM and taken internal battery out for 10 mins. When I reset PRAM or take out battery for a period of time the screen will boot up and it works fine, even if I restart its ok but as soon as shut the computer down its the same problem, I get chimes,on button lit, fan motors, but no display. This problem started when my extra internal drive started clicking (not start up drive). I removed the bad drive, even zero'd the start up drive and reloaded whole system but its still the same when I shut down. Any ideas please, thanks for your help in advance.
Daniel
Message was edited by: DRS71

Your battery is weak/dead. Check this site for battery part numbers and sources. Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
 Cheers, Tom

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http://support.apple.com/kb/ht3964
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Screen wont boot on start up

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