Good Morning,
Is your laptop still under warranty?
Do bring it down to the service center for them to have a look at it.
(Items you might want to bring: invoices / receipt for proof of purchase, your power adapter as well.)
Would be good to back up any important information as well.
Tried searching for the service location for you (went through many hoops)
but I was unable to find much information on it or if it is still at Alexandra.
Do call the technical support number located at this page
http://support.hp.com/sg-en/document/c05083351
Have a great Friday and a nice weekend ahead!
Cheers
Intrinion