Is our cRIO toast?

[MAldridge]

I would also say to crack the case and vacuum; in many cases that will solve your problem. Then you should get a null modem cable and see if it outputs anything. Just hook up with a console (9600,8,n,1) and look to see if it boots at all. Even if it doesn't output anything intelligent, note if it outputs anything. If it doesn't output anything at all, I would say it's the fuse, at which point I would see if it is under warranty as those are a real pain to replace.