Seems like you use a IDE ATA hard drive and it fails to boot up. You could try to open the PC up and make sure that the black jumper in the back of your main hard drive is set to "MA" (MASTER). Any other drives that you have such as your CD-ROM, DVD-ROM must be placed as "SL" (SLAVE). When done, open the BIOS; when you turn on the computer, the post boot screen will come on, look for where it will tell you what key to press to get into the BIOS, All systems are different, some are done by pressing the F2 key, or the F11 key, my system uses the DEL key. On Compaqs and HP its usually the F11 key. Once you are in the BIOS, you need to find the section on the Boot Order. The boot order should be placed in the following order:
1. HDD (Hard Disk Drive)
2. CD-ROM
3. USB, FDD or NET
When you finished that, navigate back to the main screen of the BIOS (by clicking ESC) and make sure you select the option called "Save and exit" or something similar, just make sure it saves it. Then just reboot and hope it'll work.
If it didn't help, i'd suggest you to replace your harddrive.