Thanks for the responses. I'm using a Tascam US 428 with a P III @ 1133 mhz. The memory is 512 MB. The mother board is an AZUS. I had OPUS 2000 build me this custom DAW computer. I get short bursts of audio noise and the red led that indicates the hard drive is working lights up for short bursts. I'm using Cubase SX and Reason. My power is fine, but I'm wondering what could be happening. Sometimes if I move the mouse, it does it. It seems like there is a problem with the processing.