A noisy hard drive is never a good sign. It sounds as if the drive is failing or has failed. You didn't say what operating system you have, but let's try....
You can try the following but it may not yield much. If, after these steps, the PC does start up, try to copy as much critical information as you can to either CDs
, DVDs, flash drives or whatever you have.
Start the PC
During the boot, you should see a message to press the F2 key to enter setup - press the key when you see this. You key might be different, but press the one it says to press.
When you get into setup, find and change the boot sequence so that your CD-Rom looks first for an operating system
Insert your backup operating system disk - I hope you have that.
If you are not comfortable working with your PC at this level, it's usually best to take it to a repair shop. The advantage here is that even if they can't get the PC to run, many shops can still recover at least part of your data unless the drive is really destroyed.
The disadvantage is the cost - which can vary widely.
Now see the directions below:
Running Recovery Console without installing it
If you cannot start your computer, you can run the Recovery Console from the Microsoft Windows XP/2000 startup
disks or the Windows XP/2000 CD-ROM.
To run the Recovery Console from the Windows XP startup
disks or the Windows XP CD-ROM, use the following steps:
Insert the Windows XP startup disk into the floppy disk drive, or insert the Windows XP CD-ROM into the CD-ROM drive, and then restart the computer.
Click to select any options that are required to start the computer from the CD-ROM drive if you are prompted to do so.
When you're prompted to press F6 for mass storage devices - press F10 instead. This will automatically start the Recovery Console.
Alternatively, when the "Welcome to Setup" screen appears, press R to start the Recovery Console.
If you have a dual-boot or multiple-boot computer, choose the installation that you need to access from the Recovery Console.
When you are prompted to do so, type the Administrator password. If the administrator password is blank, just press ENTER.
At the command prompt, type the appropriate commands to diagnose and repair your Windows XP installation.