Hi, and welcome to a.org.
Before you go on sending your miggy to strange places, there are a few things you can try yourself.
Open it up, and try and press all the chips so they are firmly in place. Make sure that nothing got out of place during transit.
Btw, come by #amigahellas in grnet (irc), that's where we hang out, someone will be able to help you, or maybe set up a meeting for someone else to take a look ;-)
