[lolwat]

I just finished a 5-6 hour Halo 3 session, 10-15 minutes ago I could smell melting plastic, my PC is next to me so I checked it out and no problems. My only options where really my TV or my 360, so I went sniffing around the TV; no smell, so then it must be coming from the console. I quickly unplugged the console and checked underneath it and no problems, but then I could see a wisp of smoke coming from the DVD-drive, so then I plugged the console back in and quickly ejected the DVD-drive then removed the disk. The disk had brown burn-marks on it so then I definately knew it had something to do with the drive.

Any Ideas?

[Couriant]

... don't play for 6 hours?

I assume the console was still on after you finished?

[etaf]

how old is it ? take it back and change for warranty, thats not normal and a fire risk, if left you could have a fire at home,
I dont know the Xbox, but it could be a few things - power supply, main board, DVD player anything that near and around that CD