MacBook Freezing/ Turning Off

hello all-
Although I've been reading this site for a while, this is my first post- sorry about the length of this, but I want to be as clear as possible.
I have a black MacBook Core Duo 2GHz, 1 GB Ram (512x2). I've had the computer for about 4 years now (Apple Care expired several months back)and have tremendously enjoyed owning it. Originally it came with a rather small HD (I think it was about 80GB) that recently crashed. I swapped it out for larger HD. Originally I tried a WD 320GB at 7200RMP but was continuing to have problems so I swapped it out for a WD 500GB at 5400RPM but my problems persist! For some reason, the issues occur at lesser frequency with the WD 320 GB at 7200RPM.
Here is the issue (note, prior to the HD crashing I never had any problems): the computer at random times will freeze (nothing works: force quit, mouse/ keypad, keyboard, etc). The only way to get it out is to hold the power button or take out the battery. After that sometimes it'll boot back up and sometimes, I'll have to keep taking the battery out a couple of times until it boots. Oddly, at times, the computer may stay on for hours without any problems and at other times, it won't go 5 minutes before it crashes. No matter what, I can't consistently replicate the freezing. I've updated the software and yesterday installed Snow leopard hoping it's a more stable OS- but the problem persists. Crash and System logs show nothing. I've done the verify disk and permissions with no benefit. I've run hardware testing via the install disk and came up clean. I've reinstalled the OS at least 3- 4 times to no avail. I've reset the PRAM and PMU, neither of which helped. I've even tried to switch out the RAM but that didn't help. At this point I don't know what else to do.
I took it into the Mac store and the guy basically shrugged his shoulders and didn't do much else. He didn't run any kind of diagnostics testing. His only suggestion was to leave it and open a work order and have the tab running while they work on it. Unfortunately, he couldn't give me any idea of what's wrong or how much it'll cost to fix. I'm reluctant to do this because I don't want to end up with a bill for $1000 or more. I like this computer, but I have a limit as to how much I'll spend on fixing it- it may be cheaper to just get a new MBP.
Any advice or direction would be greatly appreciated.

I have a similar issue: Almost 4 yr old MacBook. Started randomly freezing up (not blank screen)about 3 months ago. Will run normally for hrs or even days, then it just freezes. Usually after sleep. Sometimes, it will freeze up if I pick it up off of the table. I can unfreeze it if I tap on the left side of the trackpad area. Then, after about 5 seconds, airport drops out. If I manually induce sleep and awake again, airport reconnect. I have tried all possible tests and solutions; reset all the system stuff, reinstall the system, etc. Just went back to the genius bar this week and was told it was a failing hard drive. Replaced the drive-no change. I think my problem is related to a faulty system management controller. Don't know if there is a fix for it. I can use my macbook regularly most of the time. It's just frustrating that no one, even apple can diagnose the problem.

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Display Sleep Timer (Minutes):    10
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Revision:    0x0000
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<Edited by Host>

olacurrency wrote:
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Genius reservation http://www.apple.com/retail/geniusbar/
on-line https://getsupport.apple.com/GetproductgroupList.action
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Hello,
I had to replace the battery of my white MacBook (13 inches, mid 2010), because it was swollen, and the capacity was about just 20-30% of its original one. I bought a new one. Specifically, this one. After replacing it, I have those problems:
When I run on battery, the computer suddenly turns off at about 40% of the charge. No warnings. Just turns off.
The trackpad is not working properly. I can move the mouse, but I can not click. The swollen battery was pusing the trackpad, and I guess it's broken now. I don't know if I can replace it.
Coconut battery tells that the maximum charge of the battery is below the design capacity. Not sure if this is a problem, or Coconut battery is just comparing my battery's numbers with the theoretical numbers of a brand new battery. Check a screenshot
The battery drains too fast. From 100% to 65% in about 20 mins. So, at the end, I have less than 1 hour of battery time.
I've tried resetting the SMC, following these instructions. Specifically, pressing (left side)Shift-Control-Option keys and the power button at the same time, releasing all the keys and then pressing power button to turn on the computer. Not worked. I think it was even worse.
Could it be a problem of this specific battery? Or maybe just the MacBook doesn't accept batteries like that one? It's not original.
In the first case, I would return the battery to get my money back. In the second case, I guess I should have bought an original one.
Additional data that may be useful:
Mac OS X 10.8.5 (12F4S)
EFI boot ROM version: MB71.0039.B0E
SMC version: 1.60f6
About EFI boot and SMC versions, those are the last available official updates, obtained from here.
Many thanks in advance.

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This is kind of a long story.
I have a 13-inch, Mid-2010 MacBook Pro running OS X Mavericks. I was using it near a bathtub, when a moderate amount of water spilled onto the keyboard. I immediately dabbed out most of it, and put it upside down for some time. It was running then, with all the keys and trackpad working fine. t turned it off, and tired turning it on after half an hour. Nothing. I decided to keep it switched off for 7 days, during which I would open the lid every now and then to find vapor on the screen from the keyboard which I would wipe and close again. I turned it on when there was no vapor spotted for 3 days. I plugged it in after 7 days, to see that the battery status indicator was erratic. It turned on with a sound from the SuperDrive (the usual click). There was no startup chime. A few minutes later, it turned off. I decided to reset the PRAM and SMC, and I realized that I can get to my account window successfully (and type a 22 letter password) as long as I keep any key pressed throughout bootup (option, command key, etc). I have tried many times, but it just turns off with a "nik" sound. I haven't backed up, and I have about 270 GB of important data stored that I CANNOT lose.
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Ishaan.3108 wrote:
I haven't backed up, and I have about 270 GB of important data stored that I CANNOT lose.
Take the HDD out of the MBP and install it in an enclosure. Connect it to another Mac and see if you have access to the HDD. If so, copy what ever files that are important to you to another HDD.
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Ciao.

MacBook Freezing/ Turning Off

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