While I'm at University, I can't go on XBL. For this reason, I spent the majority of my single visit to home downloading as much single player DLC I can afford. This included New Robot Revolution. 
 
I just tried to play it now. Not only does it not show up on the quick travel list, but neither does the previous two DLCs I've paid for (and played). 
 
What the hell? Why should I have to be online to play single player DLC? Is there anyway around this or am I stuck? All my searching online gives me queries about alternate XBoxes. I've only used my own and its all on the hard drive. 
 
Please help.

Well, have you had to replace your 360 ever?(red-ring, ect) If not, then you might just have to hop online (or call 1-800-4MY-XBOX) and make sure that the serial number for your console is set with he serial of your harddrive.

" Well, have you had to replace your 360 ever?(red-ring, ect) If not, then you might just have to hop online (or call 1-800-4MY-XBOX) and make sure that the serial number for your console is set with he serial of your harddrive. "

" @MysteriousBob: In that case, follow this when you have the time. Usually the consoles and harddrive in a box are pre-registered together, but there's the off chance that it may have been missed. Once that;s done, connect to Live once, and BAM, you should be clar sailing. "

" @Driadon said:

" @MysteriousBob: In that case, follow this when you have the time. Usually the consoles and harddrive in a box are pre-registered together, but there's the off chance that it may have been missed. Once that;s done, connect to Live once, and BAM, you should be clar sailing. "

What? No- its just this game. Its Borderlands. ME2, F3 and all the other games I own DLC for let me use them offline. I have played Zombie Island and General Knoxx previously but thats while I was online. Even if what you are proposing was the problem, I told you that I can't connect to Live. Thats the issue to begin with. There's nothing wrong with my machine. "

Call customer support.  I'm pretty sure I've played this offline.