so running on maverick on primary macbook pro drive , put yosemite on external hard drive. later deleted yosemite external hard drive reformatting it. when boot macbook pro does't give me original grey apple boot up. anytime turn on macbook black screen pops first grey background apple logo pops up. anytime hold down "option" key during boot it'll go black screen hard drive , recovery startup , has black background. when click select network has yosemite ui , not mavericks. how fix this? don't yosemite @ all.
that's result of firmware update part of yosemite install.
afaik, shouldn't affect booting , using mavericks, if want use well. however, boot sequence affected, include of screens supplied boot rom, such network selection window. - if booting mavericks partition, boot graphics affected.
others may offer ideas here, or contact applecare, , ask new boot screens.
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