Hi, My late-2013 iMac has been staying at the boot screen for about 5 seconds before showing the Apple logo. All my other Macs don't have this problem and display the Apple logo within 1-2 seconds. (call me picky or OCD, but I'll assume that something isn't right and that an EFI rootkit might've attacked my iMac - definitely not Thunderstrike, but could be something related to the flawed suspend-resume implementation of Apple's sleep mode). I've ensured that the startup disk was selected and tried a NVRAM and SMC reset, to no avail. A clean install didn't help either. Has anyone experienced this as well? I'm thinking that there might be something with the EFI.