http://www.llamma.com/xbox360/repair/Xbox-360-error-codes.htm
0102 unknown error - littereally means the console does not know what is wrong. possibly a short or cold solder joint somewhere (2 reports of people repairing this, one was removing moisture build up inside the console, the other used a hot-air rework to reflow the BGA Ram chips)
Looks like you'll send it in, unless you want to risk messing with it...