MacBook Air lags, won't shut down

I started having problems with my MacBook just this week. On Monday, after turning it off it wouldn't turn back on again. It was only 12 hours later when it would finally respond and eventually turn on. I thought that was the end of my problems...
Last night it suddenly got really slow. I closed all my applications, but it still continued to lag. It takes a long time to load any applications, the cursor lags when I try to bring it across the screen, and it's too slow to process switching between different main screens when you swipe the track pad. The beach ball comes up of you try and do anything.
At first I was scared to turn it off because I was afraid it wouldn't turn back on again. But it's pretty much unusable right now anyway, so I figured I'd give it a shot. Now it won't turn off. Right in time for my exams.
I have around 120GB of space left so its not that it's too full, and I've already tried the verify/repair process with the hard drive.
Any suggestions? It would be greatly appreciated.
Thanks!

Make sure you quit out of all programs prior to shuting down if you have not done so.
Boot up from your install DVD and run "Repair Disk" from the Utility menu.

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It seems like this only happens after I've been dealing with large files or, I guess, doing a lot? Example: I've been working on a large-ish file in Pixelmator and if I work on it long enough, the program lags. I also just purchased a rather large album on iTunes this morning (close to 60 songs) and when it was finished, iTunes lagged. Whenever something like this happens, I try to restart my computer just to sort of refresh it, I guess, but it just sits with my wallpaper and the spinning circle on the screen. For hours. Until I hold the power button, but this distresses me, as this is the EXACT reason I bought a Mac in the first place.
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Welcome to Apple Discussions!
Is your software all up to date? If not, that would be the first thing to do. When done updating, be sure to repair permissions.
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Can you boot to the Apple Hardware Test? If so, it might be worth running the extended version of it to see if anything shows up in the form of an error code.
If you don't get an answer here, you might try asking in the Snow Leopard forum. Unless something shows up on the hardware test, this sounds like more of a software problem.
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shelbell508 wrote:
I tried to run the disk utility and it wouldn't run properly
Exactly what did you do to run Disk Utility and exactly what happened up to the freeze?
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MacBook Air lags, won't shut down

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