What is happening when blue screen appears at login

Does anyone know what the OS is doing between the time the while start up screen with the spinning timer(?) goes away until when the user list appears?
The reason I ask is that the blue screen seem to be taking longer than usual, and I am wondering what might be happening and if I should be concerned.
All help appreciated.

If you hold down Command-V during boot, it will go to verbose mode and you can see what is going on.

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If nothing else works, you might try this one. It has worked for many others ...
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keithfrommariettaOct 12, 2014 3:25 PM Re: IPAD2 very slow after IOS 8 upgrade
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SOLVED: IOS 8 Issues on iPad 2:
I just returned home from a visit to the Genius Bar. Like you and many others, when I upgraded my iPad 2 to IOS 8, it became practically unusable. It was VERY slow, lagged whenever trying to to do anything. Lots of screen freezes and apps spontaneously crashing. I was convinced that the processor on the iPad 2 just couldn't handle the new IOS and I went in to see about restoring to IOS 7.
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... if that happen again.. look in system event log file...there could be a hint whats going wrong..
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on the first look ...your free space 4GB ... .. due huge temp data near full .. keep an eye of this ...
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Hi there
I must express my overwhelming frustration with my satellite M70 laptop as I have it for more than a year now(warranty expired) and almost from the get go it had a problem in wich a blue screen appeared and the pc reboots...from the error report it is a problem with the graphics card and/or display driver.
I did take it to my local retailer for repair but the problem still remains(gone there 3 TIMES! each time waiting for more than a month for repair!and they did send it to toshiba service...)... as the problem doesnt happen *all the time* it seems they just didnt notice or something :(.
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Hi Andrej and thanks for the reply
But the thing is I have already done that countless times...and the problem is still there...same old same old :(
I have tried seemingly everything...thats why I say its gotta be hardware :S
Having this in mind Id like to know if there is anything I can do(concerning hardware) without resorting to Toshiba service
Keep in mind that Im pretty sure it is the graphics card that is faulty(I dont know if its onboard or not)
Also sometimes when I turn it on the graphics on my pc go weird like an abstract painting or something lol...thats another reason to think its the graphics card.
So anyone can help me?
Thanks in advance for your replies :D

What is happening when blue screen appears at login

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