I have an intermittent problem where the keyboard and navigator/ pointer freeze up. I use to think it was a memory problem but I have since found if I squeeze the base of the computer to the left of the inbuilt navigator pad everything comes good for a while.
The problem is the motherboard. From years of fatigue, the lower left portion of the motherboard develops small cracks, most likely from lifting the computer from this side. I had this same exact problem and after talking to Lenovo tech support, replaced the motherboard. Problem solved.
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Re: R40 keyboard problem
Re-install the drivers.
Go to your "Device Manager" (Right click on ‘My Computer', select 'Properties', click the 'Hardware' tab, click the 'Device Manager' button. Click the "keyboard"). If there is some kind of a "Warning" icon superimposed on the 'keyboard' icon there is your problem! Uninstall the DRIVERS for THAT DEVICE only. Click on the faulty devise and hit the remove button, follow the instructions given by the program. Shutdown, restart, the device will automatically reinstall by the "Found New Hardware" program.
Repeat for 'navigator/ pointer'.
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When a system freezes it is typically the memory or video failing. It could also be overheating too. Try opening the unit and blowing out all the dust. Ensure the in and out air ports are clear too. If this does not help them you may have to have it services by a professional.
Navigate here: http://www-307.ibm.com/pc/support/site.wss/migr-46024.html
Click the link for Mouse/TrackPoint
Select the driver for the Windows installation you are using.
Note: The machine type on the R40 does not matter for the Mouse/TrackPoint driver, only the Windows version you have installed.
make sure the lead from the mouse has a secure seating and the lead is not bad/faulty or you might have to uninstall the drivers then reinstall the drivers control panel mouse you should see 4 tabs buttons,pointers,pointer options and hardware under hardware you can troubleshoot or select properties under driver you can update driver,rollback driver or uninstall and under hardware you can troubleshoot in xp as for the keyboard try control panel,keyboard hardware troublesoot or control panel administrive tools computer managent device manager scroll to keyboard you could see a yellow question mark? right click to install drivers or blow all of the dust out of your keyboard making sure there is no moisture in the airlines dust causes static which can affect all of a computers parts hope this helps
It is not the problem with the mouse Since you have said "I have
to key in Ctrl-Alt-Delete to unfreeze it"
Which means an application in the os is taking a lot of memory and cpu consumption thats why it seems not working
****************** To confirm it(Whether mouse is causing trouble)) try running any live operating system(Linux,ubuntu,suse,fedora..etc) or different os(LInux...etc)and check whether the problem still persists
sounds like there is a problem in the hard drive. Go to google and search for Hirens Boot CD it is about $10 but its well worth it. Boot from this CD and run the Check Disc Utility(chkdsk) and some of the virus tools, this might fix the problem, otherwise it sounds like a bad CPU or faulty RAM may be causing this broblem