One beep means it says system halted unsupported video configuration. MSDOS VESA Video mode 103 is required to display something like F2 bios setup.  You can only use a legacy X16 video card. You cannot use M2 to PCI-E storage in the X16 slot nor can you use other storage or network controllers in the X16 slot.  Its video only. Take out all cards and disconnect all storage then test with one ram stick and onboard vga. System halted!Attention: Unsupported Video Configuration Detected Action is Required This computer has an add-in graphics card, but the monitor is pluggedinto the integrated video connector.To attach the monitor cable to the add-in graphics card: 1. Shut down the computer2. Plug the monitor cable into the add-in graphics card connector.This may require a video adapter or video adapter cable.(provided with the system)3. Turn on the computer. This message should not appear after completing these steps.For more information or help, please refer to the system documentation [IMAGE]Cannot use onboard when card is in X16 slot. Cannot be M2 NVME card can only be VIDEO card [IMAGE]This requires VESA Mode 103 in bios    
Hi. I have an old Dell 780 SFF and I started it without RAM modules, But diagnostic lights show that:[IMAGE] Based on Dell 780 Service Manual, When we start PC without RAM module, The diagnostic lights must turn on in following pattern: [IMAGE] This is my question: This is a normal error or no? How can I fix it? In this time, RAM module isn't available for me; But if I must test it with a RAM, I will find one.(if that isn't a normal error) Thanks. 
Solid Green, 3 and 4 not blinking