Take the battery off, wait ten minutes to put the battery back, it should work to the next time, the next time can be day, month or years, if it keep being a problem there are 2 solutions by dell
a) Install a bios upgrade
b) change the keyboard plate
If you are out of warranty b) can be expensive, for a) you should use the dell website to download the bios upgrade and follow the instructions
The full discharge usually resolves the problem for months (Mine has 2 years without incidents)
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