Won´t boot up and loud hissing sound when battery is in.

Hello, I have a powerbook g4 and leopard installed. The other day the computer started making a loud hissing sound and had a black screen(it looks like is in sleep mode) won´t come out of the apparent sleep mode. If I take the battery out it stops making the loud hissing sound but everything else remains the same. Also the light in the power cord is acting werid. The only thing I got to do was to finally turn the computer off and tried for about 3 days to charge it but the powercord wasn´t working so finally it worked(after 3 days) it almost booted up but then went into the sleep coma again. (the light indicator in the cable turned off but after taking out and put in it back in the light turned on. Please help, I can´t find any good answer for this!?? thanks everyone in advance.

I just went over and looked at the computer and it seems that is making the hissing noise again even with the battery out.

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Won´t boot up and loud hissing sound when battery is in.

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