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you lost your cable signal....
the guide is saved in the box, thats why you still see it
that temp off air message is also generated by your box because its not recieving anything from your cable provider.
make certain all cables from wall to cable box are tight then call your provider
try hooking all systems involved to the same electrical circuit, using a power strip if neccessary. also check your big screen and other equipment and make sure that any polarized plugs are in correctly. if you are an electrician, or know one, check the circuits that you're using to be sure the outlets are wired correctly. if the ground, neutral or power are not wired to the outlets properly it will seem to work, but not right. check the "cable line in" at the ground block with a multimeter for excessive power or get a qualified cable tech to check. when you touch the cable coming to the box or the tv and also touch the cable in do you feel a tingle? if so, it is most likely a power issue as mentioned above.
Check the power supply circuit. Typical voltage at B+ is 105V. Chances are that it is much lower. Check (as you say), capacitors on the primary circuit of the SMPS. Better still, replace all low voltage capacitors within the power supply.