How To: Fix DELL XPS 5520/5510 CPU stuck at 800MHz /0.78GHz issue

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Problem

This is how the issue looks like, the current clock speed is off, it is never at minimum during boot time.

The Fix

… or rather two of them:

  • Remove the battery and while the power cord is plugged – turn the computer on. Press F2 immediately to enter BIOS to verify that the issue is fixed immediately.
  • If you don’t want to void the warranty by opening the laptop – completely discharge the battery by turning computer on repeatedly until nothing happens when you press the power button. Then plug in the power cable and turn the computer on (some people report that you need to press the power button for 10-15 seconds).

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