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Hello,its Safeer from Justanswer Tech Expert here to assist you.
Please let me know how many graphics cards you have in your computer, if you have one graphics card i recommend you to connect Monitor to graphics card port
otherwise if you did not install the graphics card driver software in your computer, i recommend you to disconnect Graphics card and get display from main Motherboard Monitor port and once you have display install the graphics driver for your card model from vendor site and shutdown computer to connect graphics card again to boot computer.
Most updated drivers can be downloaded from nvidia or amd website depending on model of your graphics card. that is the first step has to do before connecting gpus. thank you for the question.
please open the CPU case to see if there is additional graphic card installed, if there is remove that and also RAM memory remove and connect it back. and connect Monitor to motherboard monitor port to get display.
appreciate if you can share desktop model and picture of backside ports.
you may remove the Hard disk from old pc and connect it to new pc to backup the data new pc.
hmm it has hdmi or vga port, should be in backside only.
did you try both HDMI and VGA port in backside of your desktop to monitor.
hmm, then there is something wrong with your computer, not display problem. please try RAM memory remove and put it back and start computer.
the computer should have display to backup files, otherwise option is to Hard disk connect to another working computer only as last resort.
you may get USB enclosure for hard disk, so you can connect old HDD to your new Computer USB port.!
device like this, Hard drive USB enclosure (plz check the link): https://www.amazon.ae/ORICO-3-5-inch-External-Enclosure-Caddy-3588US3/dp/B00GAML7OK/ref=asc_df_B00GAML7OK/?tag=googleshopp09-21&linkCode=df0&hvadid=378719056043&hvpos=&hvnetw=g&hvrand=*****************397&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1000010&hvtargid=pla-404289693270&psc=1