blinking cursor

Hi, today i bought asus k52n. when i tried to power it on i got a message : please insert a boot device, and so i did, i entered a windows xp cd, instalation started and after few minutes blue screen appears. i restarted asus, and only frozen blinking cursor appears. i cant enter bios or anything. nothing is working. i tried several different cd's, but black screen with blinking cursor remains. please help thanks

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