I have a strange problem I don't know how to interpret. I've recently installed a new motherboard and CPU within the past couple of months. Twice since then, I've turned the monitor off and walked away to watch TV while a program downloads. Then, out of nowhere, it makes a little click sound and a whirring down like right after a proper shut down has been completed -- but, within a second, the whirring of whatever motor I'm hearing (HDD?) kicks back on again. Each time I've rushed to the computer to find it still on the webpage, downloads uninterrupted, and totally functional. This is driving me crazy not knowing what's going on! Please help me understand, since my system is otherwise fully functional with no other oddities. Here are my system specs: ASUS P5Q Pro Turbo Intel Core 2 Duo E8400 3GHz 4 GB DDR2 Corsair RAM 650 Watt Antec Earth Watts PSU 260 GTX nVidia GPU Thanks!