Acer Gateway NE56R Laptop showing strange or grabled screen. What should i do?

After joining the IT course in NIIT for the software engineer. I just bought for me a new laptop which is from acer and it was under a offer so i though to go and buy it. The model number for acer is acer gateway NE56R and i like the laptop earlier but now i think i should throw it in the dustbin.

It got it repaired thousand times and still continuously same problem from which i have been suffering. The laptop turns on properly but shows bad, wrong or garbled image on the screen. What should i do? Please help me.....;

I would suggest you to go and first check you laptop with image output onto some external monitor and if it shows the same failure then it should be a Graphics card failure.

If graphics card is working well then go to a nearest shop to get your problem fix.