System is constantly freezing. What is wrong?

I've been having some serious problems with my computer in the last couple of weeks. System completely freezes.
First time it happened, I was listening to music on iTunes while away from the desk. It was the only running app. Music simply stopped. I tried to force quit it, but it didn't respond. After it happened 2 times in the same circumstances, it started freezing over Safari or Mail... So I decided to reformat my computer.
After performing a complete reformat, wiping out user data and updating software up to the latest versions, it was working smoothly. Until it started doing it again 2 weeks ago. I had to once again force the computer to shut down, several times.
Last week it went into a gray screen that just wouldn't go away. I tried to perform a safe boot and starting up from the OS disc several times without response. Then, I decided to perform another of the recommended steps in the help topic and reset the PRAM. Afterwards, it got to the Apple logo but it also revived an old issue of the computer screen going black, as if asleep, at startup. Meaning I had to force it to shut down several times again, because I couldn't log into the system to see what was going on the screen or shut it down through the user dialog box.
After a couple of days of not being able to use the computer at all, I got it to start up to the OS disc, ran the Disk Utility, that found everything to be OK. Then it finally got the system up, but the problem still remains. The system is still locking down over simple tasks. It's come to a point where every time I've had to force it to shut down.
I fear there may be something wrong with the hardware, but no idea what it is. I checked the RAM and it's showing up the correct amount. I was thinking about reinstalling the system again, but I fear that may not solve the issue.
I was wondering if there may be an issue with the electrical power. After I tried to startup and got the gray screen, I shut it down, unplugged it and the following day was able to start the system. When I left the power cord untouched I was never able to get the Apple logo to show up. Could it be a battery issue? Logic board? I'm just guessing here, I don't know much about this technical stuff.
Any ideas would be greatly appreciated. I really don't want to buy a new computer right now.

If you have not already done so, when troubleshooting make sure you disconnect all divices except for the keyboard & mouse from your computer.
How much HD space do you have left?
The following User Tip should be helpful: Mac OS X 10.3/10.4: System maintenance
Also check out your OS Help Manual, Mac 101 Quick Assist & Mac 101: Troubleshooting 101: Introduction

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My computer freezes occasionally when it is used after being sleep for a while. The spinning ball appears and everything is totally disabled. Nothing on the keyboard works.
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                    MacBook HD (disk0s2) /: 159.18 GB (29.38 GB free)
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          HL-DT-ST DVDRW GS23N
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Hey greytdogs,
I would give some of the suggestions in this link a shot:
OS X Mavericks: If your Mac runs slowly
http://support.apple.com/kb/PH13895
Welcome to Apple Support Communities!
Sincerely,
Delgadoh

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null
null

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