Dimension 2400 - Blue screen messages

For the past week I have been hearing clicking sounds coming from the area of my hard drive right before my Dimension 2400 would lock up. The only way I could then shut it down was to push and hold the bootup button. After unplugging the power and waiting a few minutes it would boot right up and be fine. I took off the cover and blew out the dust with compressed air, it was pretty dusty. Sometimes it would be OK for hours and sometimes only a few minutes before it would start again.

 

At first the blue screen message that was coming across was:

 

A problem has been detected and windows has been shut down to prevent damage to your computer, a process or thread crucial to system operation has unexpectedly exited or been terminated

Technical info: *** STOP: 0x000000F4, (0x0000003, 0x8657E020, 0x8657E194, 0x805FA160)

Beginning dump of physical memory

 

After the first couple of times the second the blue screen message changed to:

 

KERNAL_DATA_INPAGE_ERROR

Technical info: *** STOP: 0x0000007A (0xC03DDF6C, 0xC000000E, 0xF77DB384, 0x3A3A9860)

*** atapi.sys – address F77DB384 base at F77CE000, date stamp 41107b4d

Beginning dump of physical memory

 

Now I can not get to the start up screen before it goes straight to the blue screen message of:

 

UNMOUNTABLE_BOOT_VOLUME

Technical info: *** STOP: 0x000000ED (0x8678A900, 0xC0000006, 0x00000000, 0x00000000)

 

I don't know if it's an overheating or hardware problem. Does anyone have any insight on this? An anticipated thanks for any insight.