Two amber blinks = No Memory Modules detected Try re-seating the RAM modules in their slots. Follow the instructions in the Service Manual to remove and replace RAM. And replace the motherboard battery too, if you haven't done that recently. It's a CR2032 3-volt coin cell, ~$2. Instructions to replace the battery are also in the Service Manual. Good idea to remove the old battery first. Then press/hold power button on PC for ~30 sec. Now carefully re-seat RAM modules in their slots, making sure they're properly re-seated and lock the retention clips in place. Install a fresh battery last. Close up and connect mouse, monitor, keyboard and see if it boots now...
I turned on the computer and everything powers on the graphic card light up, the fans to start spinning and the only thing is a Dell power button starts to blink two times pause and then blink two times again then pause. It’s like an orange or amber color. Please someone help me. If you could send a video on how to fix this I would appreciate it. 
Dell Inspiron 3847. Motherboard issue??