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OK. So when you power the Laptop on, what display do you receive? What do you mean when you say, the LCD lights up? Do you recognize a backlight to the LCD or is there any information being displayed? What key are you pressing to load the BIOS settings?
That noise was caused by the failure of the power circuits from the mainboard. This is a major failure - the entire mainboard will have to be replaced. For that you must take it to a repair shop, this isn't something you can fix.
It sounds like a short in the button itself. If you have a soldering gun, take it apart and resolder the connection. This is typical for Acer laptops.
It's either the button itself or the jack where the power supply plugs in. It's not real difficult.
I replaced my screen on my 5570z, i purchased it off of ebay for 130.00 shipped, but make sure you check out there feedback, and make sure they have a ZERO dead pixel return policy. Some are sneaky and will not let you return it if you have less than 3 dead pixels.