I'm considering installing El Capitan on an elderly acquaintance's Mid 2010 iMac -- actually on one of his external hard drives. Anyone who has a 2010 iMac and who has already upgraded to El Capitan, please let me know if your boot screen is still the traditional gray or if it is now the new black. Based on what little info I've been able to find, only 2011 and/or 2012 and newer Macs get the black boot screen; however, I need to know for sure before I install it on his computer. This matters because my friend is going to continue to use Snow Leopard as his primary OS (he needs Rosetta), but he also wants to stay up to date as far as Safari goes. The problem: Several people who downgraded from Yosemite to earlier versions of OS X in the past year found that the first few seconds of their boot screens in the older OSes are still "Yosemite black," after which they haphazardly switch to traditional gray. Since the black boot screen is the result of an EFI/firmware update, there is no way to undo it. I'm sure that would really bother my friend (and me) if it were to happen to his iMac. I asked this same question on MacRumors last month with regard to my Late 2009 iMac, and several people with older Macs seemed to say that they still have only the gray boot screen. My friend's iMac is so close in age to the affected Macs that I need to know beyond a shadow of a doubt what will happen to his boot screen if I install El Capitan. Thank you very much.