Dell Inspiron stuck at .38 GHz

With all I've read, I'm almost certain it is a Dell power supply issue. Whether the two OEM Dell bricks I tried are getting old and weak or the circuitry in the laptop is going bad and sensing them incorrectly I don't know. Still doesn't explain why I saw .38 when on battery.
 
Only remotely similar case I've seen was on a Dell server. Rebooted overnight for updates and came back online only detecting 1 core at something like 1GHz when it should have been 8 cores at 2.1GHz.

Installing firmware & BIOS updates fixed that one. Couldn't tell you which in particular because I just ran the Dell SUU which bundles them all together.
 
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