Macbook Pro Won't Turn On_2008 Model

Help!! I have the early 2008 model and today it wouldn't boot up. The screen doesn't turn white or light up, and I hear a sound from the fans/superdrive as if the computer is going to start up, and then, it just abruptly dies off. The LED / sleep light goes on at first, and then starts flashing and goes off..Anyone have any ideas? Desperately need it for work, Thanks

unfortunately i don't have the install discs with me so cannot attempt this. Also i'm sure i this would not work as the computer would power off before the disc has a chance to run. To explain again, my problem happens like so:
1. I press power button
2. Computer makes clicking noise like its about to start, light on front panel lights up for 1 sec
3. light on front panel lights turns off, no startup chime noise and computer turns off
all this happens very quickly over approx 2 seconds. If i hold the power button down it stays on for a small bit longer, maybe 5 secs in total
Just noticed when i stick the charger in after a while the computer makes a strange noise, it hard to hear, kinda of a sounds like low digital noise or old modem dial up connection sound?!
cheers

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Ciao.

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Macbook Pro Won't Turn On_2008 Model

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