I have the same problem and was told to switch my box. Took it to the Comcast place yesterday, brought box home, hooked it up and same blue screen with the message that says no signal detected. Been going on about six months and what we have been doing is just using the input button on the remote to cycle back around to the hmdi input the receiver is on and it comes in that way rather than shutting down the receiver and waiting for it to reboot. Still frustrating as heck and a solution in another forurm states the problem is from the HDMI cable not getting a signal from Comcast. Two tech I have told this two over the phone and neither understood what it meant. SO the struggle is real. Real annoying!
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