Thanks for writing to us.
When did the issue start?
Was there any hardware or software changes done recently?
Please remove the battery and charger, and hold down the power button for 10 secs and then plug them back and try to power on.
Also do you see the Dell logo?
You can try removing the memory modules and then try with one module at a time.
You can find the instructions from our support.euro.dell.com--enter the tag#--submit--manuals
Do provide us your system tag#, email address and name via private message,by clicking on my name in blue and then select send a private message