I use raspberry pi 2 with ubuntu mate 16.04. Suddenly my raspberry pi is not booting. The monitor can't find any signal (via HDMI). Both the Power and ACT light is on when I start the PI, but ACT light is not flashing/blinking like it normally does. It is just on like no SD card is inserted.
I tried different SD cards, different power cords and different os images (hash checked), but the result is same.
Note: The last time before this situation the pi took more than usual time to boot, and the display was with improper resolution. After that, it is in its present state.
I am starting to think if it is a physical damage and if the SD card reader circuit/slot is damaged. (It did not get any physical hit though) If that is the case, is there any way to fix that?