Hi, My PC suddenly shuts down, usually when opening up a new process (can be any process). It then auto restarts, sometimes taking more than one go as it shuts down again towards the end of the startup process. When it shuts down a soft Clunk can be heard, I assume this is the HD suddenly stopping, but is this the cause or effect? The event log under Event Viewer - System, shows "the device, \Device\Ide\idePort0, did not respond within the timeout period". Running Windows XP Service Pack 2, AMD Athlon XP1700+ 1.47Ghz, 1.25Mb RAM, Maxtor 6L040J2 HD 37.2Gb with 13.2Gb free. Any help greatly appreciated as the problem does seem to be getting worse. Thanks, Mike.