Can't get dual display with external HP monitor and new HP laptop.

[chiggi64]

I have an external HP monitor and a brand new HP laptop.  I can't get dual screen displays even though I have the settings on 1280 x 1024 as the monitor tells me to.  It has always worked with the last two laptops; first one was HP and next one was Lenovo.  There are two ports on the back of the external monitor.  I unplugged it from one and plugged it into the other one and it worked for a day but I turned the computer off overnight and the next morning it was gone.  HP tech told me I might need a new HDMI cable, as they die just like everything else.  I also read that I might need a different adaptor.  I didn't need an adaptor when I had the original HP laptop but had to get one for the Lenovo.  I have tried removing the adaptor and reattaching the HDMI cable but that doesn't work at all.

Best Buy said to bring "all the devices" to them.  I can easily put the laptop in a backpack but the big, cumbersome, heavy monitor would have to be put into a grocery cart and on and off a bus and streetcar to get to them, so that's not really an option.

If anyone has any knowledge of this problem, I'd really appreciate your imput.

[banhien]

@chiggi64 

From the following information

          https://support.hp.com/au-en/product/product-specs/hp-15.6-inch-laptop-pc-15-fd1000/model/2101987725

Its specs :    https://support.hp.com/au-en/document/ish_9868351-9868447-16

It has

(1) USB Type-C® 3.2 Gen 2.0 port; 10 Gbps signaling rate (USB Power Delivery, DisplayPort™ 1.2, HP Sleep and Charge)

(2) USB 3.2 Gen 1 Type-A ports; 5 Gbps signaling rate

(1) Headphone/microphone combo port

(1) HDMI 1.4b port

(1) AC smart pin

How do you connect your monitor now, what is it ? You should be able to connect 2 (two) external monitors (total 3) to your machine

1. Monitor 1: Direct HDMI to HDMI
2. Monitor 2: USB-C to DP adapter to monitor OR direct USB-C to USB-C monitor.

Regards.

[chiggi64]

My external monitor connects by HDMI cable directly from it to laptop.  I did remove it and plug in a usb cable but it didn't work at all.