IMac 27" 3.06ghz white screen for 40 seconds on start up before grey apple

when i start up my iMac 27" 3.06GHZ i get a white screen for 40 seconds before the grey apple appears and it boots up.
If anyone else is experiencing this or has a solution it would be great if you could reply.
Cheers.

Hi guys,
I'm new to the forum, i have recently bought a new imac 27" i7, i don't have any problems with white screens when starting up, the imac runs great, however when i try playing any games thats when the problems start. i installed X-plane it first worked without any problems but not in full resolution, i upgraded the resolution to the maximum imac resolution and from that moment every time i start the game the screen turns white you can hear the imac starting the game and even for a while sound appears, but then after 30 seconds the programs fails and you get a typical apple message.
i have also tried installing need for speed, here i didn't change anything to the graphics however the problem occurred straight away. white screen then the sound of the games menu and crash. did anyone else have this problem? is there a solution to this? i would like to apologize if this matter has been discussed in earlier forums. However i hope there is someone whom is able to give me a helping hand here. Whats wrong???? thanks ruben

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IMac 27" 3.06ghz white screen for 40 seconds on start up before grey apple

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