Ok, did the ewido test, nothing found. I'm not really surprised. It's not connected to the internet, so the only way it would have been infected would have been through my usb flash drive. Since i don't have internet i wasn't able to do the panda activsecan though.
The best i can give you for the power supply is that on a serial tag it said SN:S51G00340E01205, on a sticker it had 9TPWR2004A, and on a label it had S/N:0311161 Model NO:AM630BS20S Achme. It's also got some power values on it.
I don't know anything about the history, sorry
Finally, akmal.avloni, i'm not sure what you mean