IMac taking ten minutes to start up and sits at a blue screen for the most of the time. Also, when it goes into sleep mode I am unable to wake it up from it.

For the past few days now whenever I go to turn on my iMac it takes roughly ten or more minutes to boot up. For the portion of this time it sits on a blank blue screen. At first it comes up to a plain white screen which after about 30 seconds has the apple logo on it and the spinning circle for about a minute then to the blue screen, every time. Then, to top it off right when this started happening another problem began occurring. The computer is set to go into sleep mode after 15 minutes of no use. But, if it is in sleep mode for too long I am unable to get it out and I have to restart the entire computer, but if it is just for a few seconds into sleep or a minute I am able to get the screen to come back. I can still here the fan running and such so I don't know what is going on. I have searched through discussion after discussion. I have tried: repairing disks, repairing permissions, starting up in safe mode, and such. There has been no luck so far. I was wondering if anyone could offer insight into fixing at least one of these problems since my schooling relies on the computer.
By the way I this is an iMac 10.6.4 refurbished which we just bought about two weeks ago.
Thanks for any suggestions!

My iMac i7 quad was having the same symptoms with the blue screen and long startup times a couple of months ago.  Apple Care told me to bring it in to the local Apple Store, and after some diagnostics, the hard drive required replacing.  It took one day to replace the hard drive and my iMac is running great. I only had the iMac for about 12 months when the drive needed to be replaced.  Not sure if that is your Mac's problem, but it was for mine.

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