I have similar problem as Zamman002 in this question http://www.experts-exchange.com/Hardware/Q_21162076.html
, but my problem is weirder.
About six months ago I had two HD's and two CD devices when first problems started.
Most of the time everything worked, butt occasionaly my HD would start clicking, which would couse the whole system to hang.
Sometimes BIOS would fail to recognize my CD devices, and sometimes if they were recognized by BIOS, Win2000 would report that device had been unsafely removed.
I was playing with this for over a month. I bought new Hard disk and new CD-ROM, but the problems continued until I removed everything from Secondary IDE channel.
So all summer I had both, new HD and new CD on primary IDE channel.
But last week it started again. Same simptoms, which were rare at first, but it started to occur more often until today morning when it was unable to boot windows becouse clicking would prevent it.
I then removed CD-ROM leaving only hard disk, and now it works again. It didn't hang whole morning.
What is cousing these problems?