Did you specifically do ALL of the following steps?:
Use Apple Hardware Test
- Open the Help Viewer’s Action pop-up menu (looks like a gear) and choose Print to print these instructions.
- Disconnect all external devices except the keyboard, mouse, display, and speakers. If you have an Ethernet cable or external DVD drive, disconnect them.
- Restart your computer, holding down the D key while the computer restarts.After your computer restarts, you should see the Apple Hardware Test chooser screen. If you don’t, Apple Hardware Test may not be available on your computer. You may be able to start Apple Hardware Test from the Internet. Reconnect your computer to the network, and then restart your computer while holding down both the Option and D keys.
- When the Apple Hardware Test chooser screen appears, select the language you want to use, and then press the Return key or click the right arrow button.
- When the Apple Hardware Test main screen appears (after about 45 seconds), follow the onscreen instructions.
Hope this helps
There are no discs, if the machine shipped with Lion as you say it did. In that case you should be able to run the AHT by booting with the option-D key combination pressed. Did you try that? If you did, and the system booted as usual, what kind of keyboard are you using? If it's a wired keyboard connected to a USB hub, connect it directly to a built-in USB port and try again.
If you want to re-install Mountain Lion, here is what I suggest:
- first create a Second Partition on your Hard Drive using Disk Utility
- Restart your Mac using the Option key (you will be able to select the Mountain Lion Recovery disk) as your startup disk.
- Then you'll be able to re-install Mountain Lion from there, on your second partition you created earlier.
- Then if you want you can use Migration Assistant to transfer whatever you need from your original partition. But my concern with that is that if the crash is created by an application, there are chances that you have the same problem on your new partition.
But it would be really helpful to know where the crash is coming from.
... The system keeps crashing,
Just to be clear, does an application crash with a dialog box "The application ... has unexpectedly quit" or does the system crash as in a kernel panic, which requires that you shut down the Mac?
Read the following for each respective event. Next time it occurs, post the crash report in a reply.
Mac OS X: Relaunching an application after it unexpectedly quits (outdated but similar)
Be sure you are holding the d key or option d (lower case d). Either one should work with both wired and Bluetooth keyboards.
It's a mix of kernal attacks and that the computer just freezes or that the wifi connection drops. I would say that the computer freezes is more common than actual kernel attacks.
I will try to re-install the OSX as you suggest, because when looking back I do think the crashes started at about the same time as when I made the upgrade to Mountain Lion (I did the upgrade in August)
Will post the kernal attack next time it happens.
Is there a log where I can see what happened before the computer froze?
I'm sorry guys. just discovered that the computer (less than a year old) was pre-installed with snow leopard. I found the original disks and I managed to get into the Apple Hardware Test. Did the full test, and according to the test there is nothing wrong with the hardware..
Will try to re-install the OS X and see if it helps my original problem.
Thanks for your help and support.