continuous reboots

I would first boot into safe mode. Go into device mangler and disable any hardware that is not vital to the PC. NIC card ect. Also while you are there check to see if any devices are using the same IRQ's. If so move them. ReBoot the PC. It sounds like there some kind of device conflict. I have also seen instances where a virus program caused a PC to Coninusely reboot. If it's not a hardware problem, try removing any virus software. Hope this helps.

I recently ran into this after installing an HP PhotoSmart printer. It turned out that the IRQ 7 was failing within the IRQ controller chip. Added an ISA LPT port, disabled the onboard one in CMOS and now it works fine.
Also, I have seen weak power supplies cause this problem. As strange as it seems, the extra draw of a video card running in 1024x768, 24-bit mode as opposed to 640x480, 16 color mode can make all the difference.
You may also want to try disabling all power management in CMOS as well as wake on lan, wake on modem etc.

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