32" Sanyo TV won't turn on (about 4-5 years old, no prior problems)?

32" Sanyo MTS stereo/SAP/dbx, Model No. DS31580: The TV was plugged into a cable box so that when you turn off the cable the TV turned off at the same time. To turn them on, however, you had to first turn on the cable box, then turn on the TV. The cable remote control was programmed to handle both, but for the past few months it seemed to take longer for the TV to actually turn on via that remote. Manually pressing the button on the TV always worked immediately. Then about a week ago suddenly the TV would not turn on at all, via cable remote, the TV's actual Sanyo remote, manually, etc. I plugged the TV power cord directly into a working outlet as well, but that won't work with any remotes or pushing the TV's "on" button manually. It was such a nice TV, great picture and sound, then suddenly wouldn't turn on. Any ideas? Thanks!