I am running a P4 comp with 512 RAM and 80 GB Hard disk, I have an external Seagate USB hard disk of 500 GB connected. From past several days the CPU shuts down abruptly but the green light in the mobod as well as the keyboard numlock light continues to glow, further only the red light in front of the CPU cabinet continues to glow. The comp cannot be restarted unless n until the power supply plug is removed n re inserted into the socket. Earlier this was occurring only once in a day but frm past 2 days CPU shuts down 4 to 5 times in a span of 4 hrs. I have cleaned my hard drive from all viruses n malwares . One thing I have noticed is that before the CPU stops the SMPS as well as the Cooling fan of the processor chip run at very high speeds making a noise similar to wind storms. Please help me on this ASAP. Thank you