Which RAM slots should I use? - Corsair
Use CPU-Z to check if you have dual rank RAM (which means you should probably leave one slot empty for each dual rank RAM stick).
Installation and Troubleshooting Guide for the HP® 63 Cartridge ...
If the black cartridge is empty, the only message that will appear is [Replace Ink]. You must replace the black cartridge.
How to Eliminate a SIM Card
You need to remove the SIM and check if the card or slot is dirty, the SIM is not out of place. ... If it is dirty, use a soft cloth and clean it.