If it boots and you can use it as a tuner, but cannot pause live TV or record programming, or watch previous recordings, then it is very likely an iHDD issue. A bad drive will often make a "clicking" sound that is out of the ordinary. This is the head trying to read recordings or make recordings.
Sometimes there are issues with signal strength that can preclude some recordings, but you could usually then watch recordings that you've made previously. Call Rogers and have them check your signal strength. You can also check the signal yourself:
"For 9865 (NextBox 3.0) & 8642 (NB2.0) & 4642 with latest firmware using the remote:
1) Press and hold the Exit key for two seconds until the power LED flashes on the front panel of the PVR
2) In quick succession, press the down arrow button twice, then press the 2 button. This will get you into the diagnostics section where you can browse all kinds of information
The "level/power" should be between -10 and +10, with zero being about optimum.
The S/N ratio is good if it’s at about 35 dB or higher, although a good HD signal can be received with slightly lower numbers. If your S/N is around 30-32 (or less) though, that could be a source of problems."