Macbook stopped working completely

Hi,
So mi have a 15" macbook pro with 4gb memory and a 360 gb hard drive and a 2.5ghz processor. the HD has 155gb space left and it was working fine, i opened a youtube video and connected the mac up to my television and in doing this the screen went blue (as per usual when you connect to hdmi). when the screen came back the video was frozen and the rainbow wheel was spinning. it stayed like this for a couple of minutes and i could click on nothing so i did a hard shut down. when i rebooted the mac was fully unresponsive the same programs opened but i could click on nothing just a rainbow wheel and every open app i hovered over was displayed as not respoonding, the bar at the top with file etc took about 5 minutes to load and when it eventually did i managed to make it shut down correctly in the hope that when it rebooted this time it woudl be ok. i left it around half an hour before turning it on again and now when i open it it takes a long while to load up and then after the desktop has been open around 5 minutes (i can click on nothing in the mean time) it says finder is not responding and needs to reopen. It has been working absolutely fine with no hitches and now suddenly this!! i dont even know what has caused it... i upgraded to lion about a week ago but other than that i cant see what could have changed. Can anyone tell me what has happened???
Would really appreciate any help,
Joe Weller

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Boot in safe mode and log in to the account with the problem. First, disconnect all wired peripherals except keyboard, mouse, and monitor, if applicable, and remove all aftermarket expansion cards. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including your login items.
Launch the application(s) and test. Same problem(s)?
After testing, reboot as usual (i.e., not in safe mode.)

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http://support.apple.com/en-us/HT201295
Reset NVRAM
http://support.apple.com/en-us/HT204063
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http://discussions.apple.com/thread.jspa?messageID=7194888
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Luke Baumgarten

Related to the keyboard and mouse or trackpad not working, I've found of late that the whole lot freeze up and that wretched spinning timer takes over ad infinitum. Only way out is to hold pwr button the customary 6-8 seconds, then re-start with pwr/option.
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Makes me want to either revert to Factory settings or, Heaven forbid, give this MacBook Pro the float test and go back to Microsoft or even dig out the old steam typewriter.
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Macbook stopped working completely

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