Windows 10: When i connect my AIO PC to a moniter, the bios doesn't display o the moniter

I have a lenovo C-20-00 AIO which i have connected to my moniter. I have hidden my AIO behind the monitor as i don't have enough space. When i boot into bios, it doesn't show up on themoniter. Please help me.

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Toshiba PC Health Moniter

So, i just recently got toshiba PC health moniter, and it wont launch. Any suggestions?

 

Moniter power up but fails to show anything.

Thank you for the advice, I will give that a try.

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Asus Moniter. Asus PBZ 77V Pro motherboard on board graphics.

I've removed the graphics card (EVGA GeForce GTX 1050) and the machine is now in it's original working state. Everything powers up but the moniter still goes black after the intial blue screen no signal message. Any further suggestions please?

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With the PC running and no moniter I assume that a network dongle plugged into a USB socket should flash indicating a connection, yes? The USB socket powers up a USB drive but the dongle does not flash and the PC does not come up on the network. Does this indicate that the unit is not booting up?

 

cpu no audio when connected to a moniter with vga

my cpu is hp elitedesk and there is no sound whenever connected to hp moniter

when i disconnect vga , there is ound in cpu like beeping ram error sound but no audio when connected to to a moniter with vga pls help me

windows 11 realtek high defination audio