y560

Hi, I have Lenovo y560 with switchable graphics laptop. from the last 2 days when i turn it on, it starts and in the middle of starting it's screen turns into various colors (only one color per boot). is it ram problem?. i already switches rams inside .also my lappy runs on adaptor no...

I am getting Dell XPS 15 i3 380M 2.53Ghz, Nvidia 420M 1GB at 47,300 and also Lenovo Y560 I5 460M 2.53Ghz(Upto 2.8Ghz), and ATI 5730 1GB at 47,000. Which one should I buy?? The Dell seems to have more powerful speakers but Lenovo has got a better Display. Also, Lenovo has 640GB HDD...