Yoshmite loading my iMAC with black screen.

Hi,
i have two iMacs and I've downloaded yoshmite on both of them. However, one iMAC loads with a white screen with apple logo and one screen loads up with a black screen and apple logo, yet they both have yoshmite. is this normal?

Ok, riddle solved: multiple hardware failure. It couldn't be fixed, so apple called immediatly and offered a new imac, new model as well, so I'm happy (if the new one works ). Must have been quite a tricky case, but I can't complain as i got a really good support during the time.
Hopefully the new one will arrive within the next week.

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Ok, riddle solved: multiple hardware failure. It couldn't be fixed, so apple called immediatly and offered a new imac, new model as well, so I'm happy (if the new one works ). Must have been quite a tricky case, but I can't complain as i got a really good support during the time.
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Hey Rollino,
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Message was edited by: spudnuty

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Ben
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My MacBook Pro is working with black screen and TV out not working.
I am sure Operating System is working fine.
What do you think the problem from?
Is it from the screen or the Motherboard?

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How have you verified that the machine is working fine? Are you able to Target Disk the machine and access the data? Or do you have another Mac to use screen sharing?
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Yoshmite loading my iMAC with black screen.

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