RE: Dell Inspiron 15 N 5010 wont turn on only beeping continuous
This means the display isn't detected.
Hold the D key though powerup - you should then get an alternating series of solid color screens. If you do not, the display is bad. If you do get those, then it's either the GPU or the video cable that's bad -- try replacing the cable first. If that doesn't solve the problem, then it's the GPU that's bad and the mainboard will need to be replaced.