My CM7000 died last year, and I went with the Tivo Roamio. I considered repairing the CM7000PAL, but it really is obsolete now compared to other products available.
Your CM7000pal may be suffering with a power supply issue as Majortom indicated...or the HDD is done (a common failure with these DVR's). This thread does contain instructions to replace the HDD if you're comfortable attempting that.
Unfortunately it's a bad time to upgrade OTA DVR's right now. There is plenty of good selection out there, it's just that none of the current offerings support ATSC 3.0. And if you live within range of US stations, which will likely adopt ATSC 3.0 before Canadian stations, this could be an issue in the near future.
DMX 68' tower, HyGain HAM 5 rotator, Antennas Direct DB8e & C5, Channel Master 7777 preamp, Siemens surge protection. TiVo Roamio DVR