RCA RCU300 Remote Control "comcast tv problems wont" Questions

...comcast cable remote) just dont come on. wont even come on by pushing button on tv. checked the plug. was just watching the game on it shut it off and went away.comeback wont turn on... power supply ...

...jumbo remote will not program to my Magnovox TV/DVD/VCR. i have a shaper image jumbo remote but it doesnt work with direct tv hd dvr can you help my jumbo remote wont work with comcast nor Harman ...