hp pavillion laptop screen goes blank

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       I bought a HP Pavillion DV1615TS laptop about 3 months ago. I am
encountering one problem rarely (i encountered it only 3 times).
Suddenly the screen goes blank - by blank, i mean it becomes a blue or
yello screen completely. Everything seems working since I can hear all
the sounds, songs etc. I can also feel my mouse moving. It just that I
cannot see anything but a blue or yello screen. I had to restart all
three times to get the normal screen back and on restart everything is
normal again. Anybody has any idea what's happening? Did anybody get
such a problem before? Should I call up HP services?

Thanks in advance,

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