Why is my MacBook freezing and acting so weird?

My MacBook Pro, has recently been freezing up a lot. First the fan gets very noisy, then the macbook freezes... And I'm forced to restart it. Sometimes when I restart it the wireless says "no hardware detected" and I have to reset the computer until that goes away and the wifi works.. Sometimes it can go several hours before freezing, sometimes it can go only two minutes. I don't remember anything I installed besides google chrome which I've deleted now. Also when I'm using it , the wifi stops working and then I go to click the airport icon to see if it's connected and that's when my computer just freezes up and I have to restart. Or sometimes I have to restart cause the internet stops working and doesn't load any pages... What can be wrong ? Hard drive? Wifi signal hard ware? I'm not sure what that's called..any ideas will help please

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From the sounds of it your system is overheating.

First lets get a tool installed so we can monitor the thermal sensors and what the fan is doing. I like this app Temperature Gauge which you can download from the App Store, there are others out there that are just as good.

While that is running and you are monitoring the sensors see if one is getting to hot and let us know. Lets start thinking of other things here that need to be looked at

Lets look at the HD and see how it looks often a system that is overheating can be encountering issues with the HD. Is this the original HD that came with your system or is it new? If it's a new HD please give us the model info on it.

Next we need to look at the systems memory is it what came with the system or did you upgrade it? If you did upgrade it what are the module sizes?

Have you also cleaned out old programs and files so your HD has at least 1/3 free space? If not you may want to trim the junk off and then defragment the HD. But before you do this make sure you have a good backup of your apps & data and run HD diagnostics to make sure the HD is in good shape.

Lastly, have you cleaned out the dust build up internally (the fan and the heat sink fins? If not it may make sense to do that and given the age of your system the thermal paste that helps move heat off of the CPU & GPU may need to be refreshed (this is a more advanced task).

Update

You really need to get the temp monitoring software on your system. It also sounds like you may need a new HD, for now lets test it out.

You'll need to create a bootable CD with your copy of Mavericks, as your system doesn't have a FireWire port and I don't think Apple ever enabled boot up with USB drives on the MacBooks.

See if there is a newer EFI for your system. Follow this Apple TN EFI & SMC firmware updates for Intel-based Macs After updating you could try booting up via the USB to be sure. If it works then use it Vs the CD.

Once you get your system booted up you'll need to launch Disk Utility and then run it doing disk repair and then repair the permissions as well on the drive. If it fails you may need to reformat the disk and re-install everything. But before you do anything on your disk make sure you have a backup.

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Okay I will definetely download that ... It's just that my computer doesn't ever feel like its hot or over heating. If that's the case do I just need a new fan? I never changed the HD on this so it's original. No upgrades made to the memory and I have a bunch of memory left more then half. And yes I took the fan out and cleaned a little pile of dust and whatever I saw in the fan .. Anything else that I should clean? What are the heat sink fins?

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If you look at this picture heat sink assembly the persons right hand is holding the heat exchangers fins that rests against the fan to the rear of the MacBook outer shell. You can also see the thermal paste (grey stuff). For now lets not go here. Just make sure the fins are clean, take the fan out again and blow outwards.

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If the system does not seem to be getting hot then we should focus on the HD's health. First make sure you have a good backup of your apps & data on an external HD. Then, do you have the recovery DC/DVD that came with your system? If you do boot up under it and run Disk Utility run repair and also check the permissions. I would also recommend defraying your HD a good app for this is Drive Genius again there are others out there that are just as good.

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How big a HD do you have and how full is it? And, how much RAM do you have in your system? Can you also tell us which version of OS-X you are running now.

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Okay I'll look into the heat sink fins. Also I need to add that when I go to turn on my computer sometimes the screen doesn't come on but the light indicating its on is on, it takes a few tries of holding down the power button and retrying for it to go on.

My HD is 250gb and there's 193.71 gb free. I'm running OS X 10.8.5 .. Also, I don't have the CD I lost it, is there any way I can buy one?

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Your System is overheating as i have dealt with this on my iMac. Find an App That has a Tempature monitor.

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do you know any good apps?

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