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Reseating or replacing the HDMI cable, confirming in the monitor’s on‑screen menu that the input source is set to HDMI, and adjusting Windows display settings to ensure the monitor is set to Extend or Duplicate instead of Disconnect. It is also useful to temporarily lower the resolution and refresh rate to 1080p at 60Hz to test compatibility, then gradually increase to the monitor’s native settings. Updating or reinstalling GPU drivers from Acer’s support site official sources can fix driver mismatches, and checking for BIOS updates for the Nitro V15 monitor may resolve persistent issues. If the monitor still shows No Signal after these safe actions, the next step is to contact Acer for further assistance.

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All the Nitro AN515-52 model oem Acer drivers can be download from this link at HelpDrivers as they have the Nitro Sense Application version 3.01.3001 at the bottom of the page just before the bios files, so go to that page. As HD has available at that link 35 files for Acer Nitro AN515-52, so check if you need any other of the old files for this laptop out on that page.

With a new M.2 SSD install the new Intel® RST Driver 20.2.6.1025.2 as the M.2 SSD drive will work allot better within Win-11 last OS build: 26200.7462 and make sure also that you install the last game Ready Nvidia graphics for the gpu and play games in the NVidia app.

You cant make the keyboard stay lit all the time unless you go into the keyboard circuits and do it yourself, which you need to the single power wire and get power to it all the time

Look at cable "E" below as that is the backlight keyboard cable on your AN515-52 and you need to supply power to a wire there, for the keyboard to be constantly light.

which ram you brought? Wait for 15-20 min after turning on laptop with new ram