HP 21 not powering on - repair/troubleshooting advice

[rprosperi]

(02-05-2021 01:09 AM)[kby] Wrote:  Opops; that’s because I didn’t notice I got auto-spell-corrected. Apologies; Deoxit G5:

https://caig.com/deoxit-gold-g-series/
-kby

Actually, Caig recommends you clean contacts first with DeOxit Red, and then treat the cleaned contacts with DeOxit Gold, as a preservative.

Unsure that this wasn't a gimmick to sell 2 products instead of one, I tried to see, and was mildly surprised to see that their advice is exactly right. Red does clean better, and it's cheaper too.

Just some advice...