What revision of BIOS do you have? What is the most current version available. If there is a newer version available, there might be a description indicating a change similar to the problem you are having.
It is usually best to update the BIOS for new features, and any bug fixes. Not starting from a disc really sounds like something that may have been skipped over earlier. If you weren't having any troubles, I might be more inclined to wait, but that (in my view) is a problem with BIOS settings. At the very least try to find a work log detailing the various fixes/upgrades. Personally, I've never regretted updating the BIOS. The general word is "don't unless you are experiencing problems".
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