I have recently bought a RPi 2 to supplement my "old" RPi B rev 2. I have a Noobs SD/micro SD card on which I am developing software for a robot project, all the coding being done on the RPi B. When the RPi 2 was delivered a few weeks I ran it once using a previously configured micro SD from the B, by SSH, and everything worked fine.
Today I swapped all the leads from the "B" to the "2", including the HDMI lead to computer monitor, to see if the Python code which was running rather slowly on the "B" would work better on the "2". I was somewhat dismayed to find that there appears to be no output on the HDMI, the monitor display saying "No signal".
I swapped all the cables and the SD card back to the "B" and everything worked, including the HDMI. I have Googled the problem and most of the solutions found seem to indicate that "configure.txt" needs amending (hdmi_hotplug=1 or something similar). I am reluctant to do this as it is all working on the "B" as it stands. I also made sure that the monitor was ready before booting the "2".
I can still SSH into the "2" proving that everything has booted up correctly. Can anyone suggest any solutions before I send the "2" back to the retailer?