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After installing Redhat 5 entreprises i am getting Out of range message on screen when i boot first time

seeing as this is RHEL 5 and this is a very well known and very well documented "bug"
and has been around in RHEL5 since 2007

do a search of the Red hat knowledge base for the answer
copy down the error and search for that
https://access.redhat.com/knowledge/search

you will need the required support contract you did buy
Because you will need to log in to red hat web site to use the search