First your PC will not boot without any ram installed. It will turn on but it will not boot.
Boot means that it starts to load Windows (original computer term - booting into the operating system). This is different from PC power on (aka PC starting or PC turning on).
When you first turn on a PC the BIOS performs a test called POST - Power On Self Test on the motherboard.
During POST the BIOS checks that all the hardware necessary for the boot process to commence is OK before it boots and starts loading the Operating System (Windows) which is on the HDD or SSD.
If there is a problem with the ram or the GPU (video card) or any other hardware problem on the motherboard it will stop and if you have a system speaker (example only) connected to the motherboard's system speaker header pins (see Item #15 on page 1-4 and page 1-1 of the motherboard manual) you will hear a beep error code telling you what's wrong. If you don't have the speaker, you will hear nothing and the PC will stay powered on and do nothing until you turn it off
What ram is installed on the motherboard? Is it shown in the list of compatible memory for the motherboard
If it starts without the ram inserted but not when the GPU card is inserted, there's a problem with the GPU card or the PSU.
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