Why doesnt My laptop " 5741g acer " boot. i for installhng xp delete linpus linux by code?

My laptop " 5741g acer " isnt boot. i for installhng xp delete linpus linux by code " dd if=/dev/zero of=/dev/sda bs=512 count=1 " .I select " usb cdrom" in bios as first boot device because there isnt other option for boot of cd or dvdrom.but lap top isnt boot by xp windows cd and... show more My laptop " 5741g acer " isnt boot. i for installhng xp delete linpus linux by code
" dd if=/dev/zero of=/dev/sda bs=512 count=1 " .I select " usb cdrom" in bios as first boot device because there isnt other option for boot of cd or dvdrom.but lap top isnt boot by xp windows cd and this message displays " no bootable device; insert boot disk". i bought laptop yesterday.How do i can select boot of cdrom (internal -no usb) as first boot device while options that there is in? please help me.
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