I have submitted the below to HP but as yet they haven't been too helpful. Hope someone can help!
Whilst using my HP Compaq nx9010 today the machine cluescreened whilst it was running several applications, one (WinAmp) which had crashed and I was attempting to close. The bluescreen said KERNEL_STACK_INPAGE_ERROR and included the STOP error code 0x0000007A. The bluescreen also caused a physical memory dump to the hard disk. The machine then restarted as it does normally in the case of a bluescreen (which hardly happens at all, maybe three times in the life of the machine). The first time the machine restarted it did a checkdisk and passed. Once started up the computer hung just after login. At this time the blue processor usage light on the front of the machine was constantly on which never normally happens. The computer then bluescreened again in the same way. This bluescreen error occurred even when starting in safe mode, after running a system restore the system still had the error. I then attempted both a recovery of the OS and a reinstall using the supplied OS recovery discs. I also attempted MBR and boot record restorations through the recovery command line the CD recovery utility provided but these could not even start as the system reported an unrecoverable error. The same occurred on running CHKDSK.
I have visited the following Microsoft support articles and have not been able to get any further. I could not change the BIOS system caching as I could not work out how to, I could not view the event viewer as the computer doesn't load far enough to access it, also I believe it not to be a hardware connection issue as the error occured when the many system resources were being used by software instead (I may be wrong but this just seems more likely from the situation in which this issue occurred).
I have no idea what to do next and hope you can be of some assistance.