Dell Inspiron 15 7559

Hi,

My laptop suddenly went off and now it wont turn back on it would switch on all the lights would show and the dell logo appeared but would switch back off immediately. By constantly pressing the on off button i managed to get it to turn on for a few minutes until it suddenly did the same thing again. However now there is no logo and the lights just flick on once and back off.

Thereafter I tried to get into the BIOS diagnostic mode by pressing f12 as soon as I managed to get it to turn on. once more however it went off as it was loading this up. Now it just wont go any further than flashing all the lights once and turning back off