I bought a Motorola DCX3400-m pvr and have had it replaced once already because of its noise. The new one they replaced the old one with is louder. If it is left on for over 5 hours this thing can get so loud it distracdts from watching the porogram. Of course it is even worse if the TV is off as there is no drowning out the pvr sound. It is also loud when it records. Sounds like a hard drive sound that is constantly clicking and swishing, etc - the sound that all hard drives have when they are in use. But the pvr is louder than a computer HD and it can be constant where as the computer is not. The cable company tech guy told me that they know that some of the units are noisy so they replace them. Has anyone had or heard of probs with this unit??? I will wait to hear what you guys think before contacting cable company again to see what other units they offer or maybe keep this one.