reboot your pc then hold down esc button repeatedly push the end button or the scrolllock button this should unlock the cpu unless its perminatly damaged. try not"during certian usage to hit or hold down thee cntrl,function,windowsbutton or thee alt key and hit End button at the same time this also happened to me as well Hp pavilion dv5 notebook 2100. dont know why but i am currently using the laptop on which this same issue accured.
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