Hai friends, I assembled a P4 system last week. The system worked perfectly, installed XP. But next day onwards I am finding an error. The system was used for an hour - then switched off - then restarted. The system is not starting, if I start again I get an error message "The CPU was previously shut down due to a thermal event ( over heating). Service the unit to resolve the problem. press f4 to resume, f12 to boot from network. The processor is Intel Pentium 4 2.66MHz (533 MHz FSB) Motherboard Intel Original 915 GAV ( Having PCI x16 slot) HDD Maxtor 80 GB SATA Memory 256 MB 400MHz iball cabinet/SMPS, LG17"Mon, Logitec KB,Mouse (The processor is with new thermal solution round heatsink -fan with 4 pin connection to MB.) The error is repeating frequently - kinldy help, or the link where I get solution for this. Padikkal.