My macbook won't turn on, it makes a whirring noise like it wants to turn on, and the light is there, but won't turn on. What could this be?

When I turn my computer (which is an older 2009 macbook pro) on it makes a whirring sound like it wants to turn on, and the light flashes, but the screen and everything else will not turn on. It is fully charged. What could this possibly be? And if its something I can buy to fix, how much money may it cost me?

If you are confident enough
make sure you are not wearing anything that generates static, ground yourself or at least touch a radiator or something that goes to earth to remove any static discharge
remove the bottom casing/cover
disconnect the battery which should just be a plug into the main logic board (some MBP's have a shield over the battery connector)
Whilst the battery is disconnected - presss and hold the power button for 5 seconds or so to reset the SMC
Remove both RAM modules if present and reseat them
then temporarily replace the botom case/cover without screwing it on and test
If that does not resolve the issue, try one RAM module at a time in each RAM slot

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