We tested it with a mains adaptor and it didn't power up, so we got the batteries out. After struggling with 6 D batteries we managed to power it up (so obviously whoever chucked it doesn't have a clue about battery compartments and power inputs, etc.). I can modify the keyboard by putting a power input to the battery terminals so I CAN use a mains adapter. The only other problem is the top F key is broken, but I barely use that anyway seeing as this keyboard's 5 octaves long.
Now comes the "what shall I do with it" problem. Well, I might use it as a MIDI controller (it's got a MIDI in and out
Pics coming soon.
If you're interested in buying (and I really don't know why you would be, but you might lol) just PM me or post here.