Today my Macbook (out of warranty) fried itself when I plugged external HDD (when it was on) to the USB port while it was connected to the mains. 
Screen went blank after 2-3 seconds after connecting the HDD and I could smell burnt plastic. I took the battery out immediately and examined everything i.e memory, hdd before trying to start it.
So I was wondering how much I could make from this? and how would I test working components i.e screen, ram, hdd, airport etc when the computer does not come on?
At the moment I'm just sorting my finance to buy the new iMac and therefore I need to get some money out of this borked machine.

Screen went blank after 2-3 seconds after connecting the HDD and I could smell burnt plastic. I took the battery out immediately and examined everything i.e memory, hdd before trying to start it.
So I was wondering how much I could make from this? and how would I test working components i.e screen, ram, hdd, airport etc when the computer does not come on?
At the moment I'm just sorting my finance to buy the new iMac and therefore I need to get some money out of this borked machine.