The problem:
The PC works for sometime (maybe an hour or maybe few minutes). Suddenly it freezes. Restarting the PC, makes it work for few minutes and it restarts or comes to a blue screen (Error : IRQ_NOT_LESS_OR_EQUAL or PAGE_AREA.... ). Restarting again brings the blue screen again just before the Desktop appears. Restarting few more times makes the PC not even bringing the Display (even Intel logo does not comes prior to bootup).
I do see one indication in this PC. When I switch On the wall socket, the PC performs a POST. The Power, HDD, Keyboard LED lights blink and the fan noise comes for a few seconds and go off. When I power on the PC after this, I observed that the PC works fine.
But when freezing starts happening, the subsequent restarts, even after a complete power down (from wall socket as well), does not makes these LEDs to blink. This is an indication that something is wrong and it freezes for sure when the PC is powered on.Strange:
I had called up a technician, who services PCs in our area. He took the PC to his workshop and it works well without doing/altering anything to the system. Change could be the input/output devices and the modem (ADSL). As he brings it back to my home, it all starts again to freeze.
Whts been tried:
1) Changed LAN cards and on different slots
2) Changed motherboard
3) Re-formatted/installed windows
4) Updated drivers (VGA, Sound, LAN)
5) Changed RAM
6) Removed UPS
7) Changed SMPS, cables
Tried to start without HDD, changed HDD
9) Tried connecting the PC to a different wall socket bypassing the spike buster
PC configuration:
Intel Pentium 4 HT CPU (3 GHz, 1MB cache, 800 MHz FSB)
Intel 865 GBF board
512 MB DDR 400 MHz RAM & 256 MB DDR 333 MHz (not used together)
160 GB Seagate baraguda IDE HDD
16X DVD-RW drive
RealTek 8139 LAN & D-Link 520TX LAN (not used together)
300W SMPS in ATX box
Scientific Atlanta (Cisco) Cable Modem
19" LCD Monitor
PS/2 Keyboard & Mouse
500 vA UPS, spike buster
HP Inkjet printer (USB)
Headfones
OS : Windows XP Professional SP2
Any help is greatly appreciated. Need to know whts the exact cause or maybe which peripheral is at fault.