My keyboard freezes/locks up randomly and I have to shut down usually 2 fix

Has anyone else experienced this problem? The modifier keys all still work (Shift, Control, Option, Command, even CAPS LOCK), but the main keyboard QWERTY etc. keys do not. The mouse also works fine, so I have to actually mouse around, quit applications (CMD-Q doesn't work) and shut down using the mouse. When I restart, it usually is fixed. I haven't been able to figure out a consistent series of things that cause this to occur. It appears to be totally random. But, I'm wondering if it is just a stuck key or some other problem with either my internal keyboard or external Apple keyboard and mouse that causes it. It happens both when the external keyboard/mouse are connected and also when the PowerBook is not connected to anything external. It's a real nuisance. Any help is appreciated! Thanks...

Thanks, Pismo. No, none of those are the situation. The entire keyboard other than modifier keys does not work and if an external keyboard is attached, it doesn't work either, so it's not just the built-in keyboard that doesn't work. And, if I unplug and reconnect the USB external keyboard or just leave it disconnected, it still doesn't work. I'm baffled. I'm usually pretty good at troubleshooting. The only thing I can think of is that something is sticking somewhere, sending a keyboard code. Or, somehow I'm randomly generating a key combination that locks it up and if I regenerate that key combo it will unlock. I don't know. Anyone else? Help! Thanks...

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Try Ctrl>ALT>DEL then click Start Task Manager, then find the process firefox.exe, then click end program, then try opening Firefox again.  done! If that doesn't work, then try re-installing Firefox or going to this link to safe mode area and click continue to safe mode and then try and exit, if this problem still occurs then disable extensions and plugins

IMac freezes in mid application and then can't shut down or reboot

I have a iMac which is about 6 years old with 1 GB RAM, 60 GB hard drive and operating on OS 10.4.8 (Tiger). It has about 16 GB memory free as well.
It was running quite nicely until about 2 months ago and then had probems with it running slower and slower while completing applications, and finally it started freezing in mid application with the spinning beachball of death. The computer has to be shut down by pulling the power. Sometimes I can restart it with the power button and . But this latest time, it did not even start from the C drive with the OS X disc in place.
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Welcome to Apple Discussions!
There is no such thing as a Mac OS X clean install as my FAQ explains:
http://discussions.apple.com/thread.jspa?messageID=607614
However, your machine is right at the age, or a little beyond where the clock battery may begin to die. This can cause slowdowns and other issues.
The hard drive could also be problematic, as some of these can die in less than a year, while others can last as long as a decade.
The more you install Dashboard widgets, the slower your machine will get, and that can cause problems too. See my FAQ on other slowdowns if neither of these seems to help:
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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
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Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem(s)?
After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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That would be command + 0 (zero) on a Mac.
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1. Reset PRAM. http://support.apple.com/kb/PH4405
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Please Help!!
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Mary a nurse

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My keyboard freezes/locks up randomly and I have to shut down usually 2 fix

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