Why won't my MacBook Pro start up? White screen and flashing question mark.

Hi,
I've had my MacBook Pro for almost 2 years now and I installed OS X 10.8 about 4 months ago.
Today I turned the MacBook Pro on and a white screen with a flashing question mark appeared. I tried then getting the startup manager up: turning on the laptop and immediately holding in alt (option). But nothing appeared for about 25 seconds until a rotating Earth labelled 'Internet recovery' appeared that gave me options to join wireless connections. However, my internet wasn't in the options and when I tried typing in the information required to join my internet the laptop would just load and never find it.
I then tried putting in my Mac OS X install DVD (10.6.7) and help in C until the apple logo appeared on the screen and the little rotating loading circle appeared. That then disappeared and a cicle with a cross through it appeared (similar to a no entry sign). Then after about 30 seconds a blue screen followed by a grey screen appeared until eventually the disc ran properly. I then went into Disk Utility but there was no option called Macintosh HD, only the discs content. It wouldn't let me first aid, erase or repair anything.
I'm totally stumped and have 4 exams at university within the next 2 weeks. I'd really appreciate it if anyone could help me out here?
Thanks,
Best wishes,
Connor

The support article linked below is somewhat outdated. Where it refers to starting up from an installation disc, you should instead start up in Recovery by holding down the key combination command-R at the chime. Release the keys when you see a gray screen with a spinning dial.
If you don't have a current backup of all the data on the startup volume, and you want to preserve that data, then you must try to back up before you do anything else. Ask for instructions if you need them.
Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to reinstall OS X from Recovery, if necessary. It won’t work with USB or PPPoE modems, or with proxy servers, or with networks that require a certificate for authentication.
A flashing question mark appears when you start your Mac

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