I have a home built HTPC with a mysterious boot issue. All of a sudden my boot time has gone from about 30 seconds to about 3 minutes. Celeron G540 with Biostar H77MU3 running LUbuntu. HDD is an OCZ SSD. For some reason the boot hangs on the "American Megatrends" screen (prior to the LUbuntu logo). Previously this screen would just flash for a few seconds but now it appears frozen. After I wait a while, the LUbuntu logo shows up, computer boots normally and behaves normally. Any ideas what could cause this?