Non-system disk or disk error replace and strike any key when ready

Either the hard drive is bad and needs to be replaced, or the operating system has corrupted and simply needs to be re-installed. HP's usually have a DFS test in the BIOS menu to see if your hard drive is faulty.

According to the following link...looks like you would have to find/get a Docking Bay to hook up an External CD/DVD ROM in order to have a better chance of putting a operating system back on it.

http://h10010.www1.hp.com/wwpc/us/en/sm/WF06b/321957-321957-64295-304455-306995-1847962-1849071-3245781.html

It means that the BIOS cannot find a disk to boot.
Make sure you selected the hard drive in the boot settings of your BIOS
Remove all external DVD drives or floppy drives or ethernet cables
If you get an error message, you should start troubleshooting your hard drive.

I would suggest try avoiding formatting. Because if you do that, then the next problem you will face is to find, download and install all the drivers.

If you are using the Genuine Windows operating system, then download 'Microsoft Security Essentials' for free from the Microsoft website. This should take care of your viruses.

Second get the latest Service pack provided by Microsoft and this should update the drivers.

And basic things, like removing unnecessary files, Defrag you hard disk, etc should also add up to the speed.

Normally this means the cpu is trying to boot from your cd drive and it is a non system disk in the drive. When you boot your cpu open the drive and make sure it is empty. If so if you have any other disks or mem cards in the cpu then remove them and your cpu should start up. If this is not the case, let me know and I will help you further.

this is a easy fix all you need is a windows xp installation disk.what you do is put the disk in and boot off of the cd option.if you need help with the xp cd installation i can write up a guide for you.also is the first harddrive new or came with the comp.if it is a new harddrive it might not have a operating system on it.email me if you have anymore qeustions or you want the guide.i can even make a video for you but it probably won't be good quality.

It could be a problem with your hard drive. It's starting to fail, may be some day you cant boot anymore. Try replacing it!

a) remove any external devices and reboot.
or
b) boot from Windows XP setup-cd into rescue-terminal, execute: fdisk /mbr
or
c) do a hdd self-test in bios (restart, press F10, tools --> hdd self-test option --> notebookharddrive) to check the integrity of your harddrive

sounds like hard disk faliure, suggest getting a new hard disk or perhaps attempt a system reinstall. Its not the fan but the hard disk.

Geoff