Now, my take on this is...the first message tells me that a cable is bad on a device which the system is trying to boot from, while the 2d message indicates that there is something wrong in the BIOS.
Since I know that BIOS problems can create other system problems, I would check the BIOS first for: correct time and date, proper recognition of drives (to included CD/DVD), and boot order. A failing CMOS battery will result in strange things happening with a system, including inability to boot.
CMOS Battery. - http://www.geocities.com/micksmix2000/cmosbatt.html
Ignore that bit about a "next day" check of the time.
If you cannot get into the BIOS, then I suggest forcing the BIOS to revert to default settings. This can be done by shorting the motherboard jumper for CMOS settings or it can be done by removing the CR2032 battery from the system.
In your BIOS, you should have the standard boot options (HD, network, CD, etc.). IMO, set the 1st option to boot from IDE-0, which should be your hard drive with the O/S and your programs on it. 2d option s/b an optical drive. There is no reason to utilize the network option and it seems that XP goes to that one automatically whenever it cannot properly boot.
If all checks out with the BIOS/CMOS, then it's probably time to try a Recovery Console command (fixboot).
Edited by hamluis, 22 November 2007 - 07:26 PM.