yum upgrade hangs

[Spundun Bhatt]

(trying again, sorry for the duplicates)
Hi all...

I am not subscribed to the mailing list, so please keep my email in your 
replies.

I am trying to upgrade yum from 3.0 to 4.0 using the instructions on 
http://lists.terrasoftsolutions.com/pipermail/yellowdog-general/2005-January/017602.html 
.

But in the step where I am supposed to run yum upgrade, yum hangs on 
resolving dependencies. If I check the files opened by yum then it keeps 
opening the package header files at the rate of about 1 every second... 
it kept running for 24hours twice without finishing...some files are 
opened more often than the others.

Btw earlier I couldnt run yum clean all.. it would always give errors...

Can anyone help me fix this error?

Thanks
Spundun