problem with oldest tower

[Amol S.]

I have 3 computer towers at home, one dead( second oldest/my previous computer tower.) A new one ( works fine Windows 7, Intel I5) , and a very old Aopen computer tower, that runs on a intel cpu ( I do not know which one, but I think it is a Intel DX2 cpu) it runs on windows 98, and it still runs.
I am having a problem after I am turning it on after 3 years since the last time I turned it on. Since the first time my dad got this used computer that the office my dad used to work in was throwing it away (around 2000-2004), every time it read its hard drive, or was thinking it made small banging noises. Now the noise is even louder. Does anyone know what the noise is?

 

[Amol S.]

update to question, the very old computer also has a 1/10 network card only, no usb only parallel ports, and two telephone inputs. It has a floppy disk reader and writer too.

 

[Ketchup]

If the computer is set to perform a floppy seek on startup, and there is no disk in the drive, that could possibly be described as a "banging" noise.

 

[Laputa]

Possibly the floppy drive or could be the hard drive is about to go.

 

[MongGrel]

a hdd id going to eat it soon it sounds like to me.