£270 for a Aspire 3680!!
Dont believe a word of it, the 3680 has a known fault with the power pin failing, as so most models!
Its not a mainboard needed, its a USB/DC Board, a small chip that sits on the mainboard... costs about £10.. dont cost acer anything.. they repair them, them selves
I can promose you, power pin failiers on a 3680 are free repairs no matter what the tech support say!!
I know, i used to work for them and repair them!!
If you have problems with it, let me know, Email me:
Address removed by fbs for poster's own protection.
I will give you honest first hand advice on what to do!