What exact MacBook (Pro) do you have? Is it the one with the 9400M/9600M GT combo from 2008?
Have you run all system updates? Since when does this flashing occur?
Is the Dock restarting during this procedure?
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1- i'm not sure
2-yes i run all system updates
3- since now , i forget to charge it , and the battery has become 0%
after that i charge it , and turn it on , and started do that
4- it's just do that thing !
Now i'll shut it down , and tell u whats happend
1 - When did you buy it? Or is it a used MBP? Do you still have the box it came in or the receipt?
3 - A restart is a good idea.
4 - Is the Dock disappearing act caused by you (Dock set to hide) or is it part of the symptom?
If a restart didn't fix the issue, does it also happen in another, even temporarily created, user account?