Grey loading screen when start up + unable to start from disc

When I start up my MBP I get a very slow grey loading screen. After a while it starts up my mac and it runs like normal. So no i finally got sick of the 10 min waiting before start up, I decided to re-instal from disc. When i normally insert the disc it starts. then I select the Instal and it rebooths. But it stays on a grey screen when reboothing.
I also tryed to start it up with C and with holding alt and then selecting the cd. With C i get the same grey screen(Without loading bar and mac logo) and with Alt it just get stuck at selecting the cd.
When I go to Disk Utility then I can use Check disk but not the delete one.
I don't need to back up, just want it to work fine again.
I hope you can help me out.

Hi Arthur, and welcome to Apple Discussions.
While booted from the install disc, have you opened Disk Utility and checked SMART status and run Repair Disk?

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Earlier today, I was working in Mac Mail and all of a sudden my computer froze. I could not force quit, restart, shut down or anything of the sort. I had to turn off the computer via holding down the power button.
Upon rebooting my computer came to a grey screen, with a grey Apple logo, a spinning grey wheel and a grey progress bar. It takes around 10 minutes for the progress bar to fill and for my computer to boot up.
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The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
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Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
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Step 11
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
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Grey loading screen when start up + unable to start from disc

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