Inspiron 15R (N5110) Not Turning On

Hi, I am having a problem with my Inspiron N5110 laptop not turning on. Yesterday I went to turn it on and all the lights turned on like normal but it turned itself off. This morning I have looked through some posts on this forum and have tried some stuff but nothing is working. Initially I tried taking the battery out, pressing the power button for thirty seconds, putting the battery back in then turning it back on but I got the same response as before. I tried that a few times more but it didn't do anything after that. There is no beeping at all and no lights are turning on. My laptop isn't old either; it's only 2 & 1/2 years old but I think the warranty has since expired.