YOUR NEXT STEP
macOS often flags apps from the internet as 'damaged' when they actually just aren't notarized by Apple. It's a security precaution.
Right-click (Control-click) the app icon and select 'Open' from the menu, then click 'Open' in the dialog box to bypass this check.
A symptom can have more than one cause. These guides help you choose a next step; confirming a hardware fault requires testing.