Welcome to the Dell Community [NAME] aggarwal  If you mean that the system turns off after 2 seconds then try this. Hold down the "D" key, push the power button, release the power button, wait 2-3 seconds and release the "D" key The laptop should go through an LCD test of solid White, Red, Green, Blue and Black 2 or 3 times. After completion it should try to automatically boot 2 or 3 times. Post your results. Best regards, U2
I am having dell Inspiron 15 7577 , when I turn on my laptop keyboard lights lit up for 2 sec and it turns off , I tried disconnecting the battery but nothing worked
Just backlight keyboard lits for 2 sec after powering on