USB-C connecting issue on Dell Monitor(P2419HC) with Macbook Air M2

moriyama0101 wrote:

I am trying to connect my laptop with Dell monitor(P2419HC) through USB-C cable.

I'm using USB-C charging cable from Apple Store. Tried 2m and 1m.

If what you are using is a "charging cable", that's your problem right there. Many charging cables do not carry data at USB 3.0 rates, let alone the higher rates that a USB-C (DisplayPort) monitor needs. They're just for charging and sometimes for low-speed (USB 2.0) data transfer.

According to the online user manual, Dell included a USB-C to USB-C cable in the monitor box. If you still have that cable, try it. I think you'll find it works a lot better.

https://dl.dell.com/manuals/all-products/esuprt_electronics_accessories/esuprt_electronics_accessories_monitor/esuprt_monitor_p_series/dell-p2419hc-monitor_user's-guide_en-us.pdf

If not, go out and get a USB-C to USB-C cable whose description explicitly says that it supports video transfer and that it supports USB Power Delivery. There are many that support 4K video and 100 watts of power (i.e., more than you need for that monitor), and they aren't very expensive. (The ones on Amazon seemed to run roughly $11 – $19 before tax and shipping.)