NEED HELP on HOW TO REPAIR This TIVO

On Start up it says Welcome, Powering Up but won't go any further. A little background on it, in case it could be related...because of an unrelated, reoccurring issue, I had taken it several times already to be serviced. They chose the last time I had, to replace the hard drive completely, rather than trying to once again repair it. When I picked it up, they turned it on, and started the set up process, so as to be able to demonstrate to me that my problem was fixed . In the middle of that process I had to leave & said that I could finish it myself later at home, and had them stop it before it had finished. I was in the process of moving at the time, so it was several months later before I was able to hook it back up. When I did, that is when I noticed the problem I'm having now, and I am no longer able to take it back to them because my Extended Warranty is now expired. Could stopping it during that process initially, be the reason it's now having this problem? Some1 told me it could have corrupted the pre-installed software, if this is true how do I reinstall it? Any help would be great! Thank you! Tyna