If my mail is any indication, an abnormally high percentage of folks who read this site are TiVo owners. If you are one such critter, I have a recommendation you should keep handy. If your TiVo breaks…or if you want to upgrade it to a larger harddisk…or if you just need new accessories, check out the folks at WeaKnees. I don't understand the name either, but they upgrade TiVos and they fix them and their site is full of tips and tricks.
You will be especially beholden to them if you have the HR10-250 DirecTV model and it stops working. This page will tell you what to do about that. Generally speaking, if these people can't fix your TiVo, it can't be fixed. They upgraded one of my many TiVos and it's worked flawlessly since then.