My 921 HDD died. During playback of recorded shows it pauses makes a clink sound, then continues for a few seconds. Called dish, and I am pleased to say they did not make me power cycle, reset, or go through any other ineffective trouble shooting steps. I asked if I could upgrade it to a 622, and was told that only one 622 upgrade was allowed per account, which really stinks because I only get about 1/5th of the HD programming on the 921 since they turned it off when I upgraded my other unit to a 622. All they can do is send me another 921. I was told my best option was to buy a 622 on Ebay wow Dish told me to go to Ebay! Cheers, R.C.