美国采购需求：电子、照明

I'm having trouble getting the rechargeable under cabinet light to work with the wall switch. Despite the light being fully charged and the battery functioning properly, it just won't turn on. I've tried multiple times, but no luck so far. Additionally, I noticed that the screws needed for mounting the light to the wood surface were missing from the package. Could you please assist me with troubleshooting the light issue and provide the screws needed for installation? Your help would be appreciated!