Do you mean, it was working with the latest PUFF BIN, and just stopped? If so, instead of wasting time, if there is light just go through the 4 stage procedure of 1. b60 boot using 2700 to 2500 loader. 2. 294T BIN using BL updater 1.4 3. PUFF_253 special boot/BIN 640K. 4. Latest BIN from another author - there are 6-7 versions out.
You can also save current settings using channel master and restore after loading.
I actually started having trouble with the signal too since i installed the 265 bin..i thought my antenna might have been moved by wind and all, but it wasnt..now, i turned the tv on and no signal whatsoever...did the back switch reboot and NADA!.
Now that i see you post i know it wasnt anything else but some type of bug in the bin, hope this guys get it fixed , the previous ones had been working flawlessly.