usb installer selectively boots Clover

[dawntodon]

I have a few laptops and my usb installer manages to get all the way to the OSX installer prompt for some devices, but for others, it does not.  Strangely enough, the devices that the usb drive does not work with has been able to load from the usb installer before, and even has Clover installed.  But for some reason, my device stopped recognizing Clover on the usb installer as well as stopped recognizing the OSX installation on the system hard drive.  Any help would be much appreciated.