no bootable device - insert boot disk and press any key
hi i have a problem when I try to install windows 7 on my iMac from FLASH USB DRIVE it's said to me after restart no bootable device - insert boot disk and press any key and I restart it and press Option+Alt and no flash disk icon showed any help, please
iMac, OS X Yosemite (10.10.3), i mac 2010