Windows 7: Black screen at boot after first installation & no startup

respected members,
i have recently ordered a lappy ASUS K53SV-SX520D from flipkart. the specifications are i5 second Generation processor. it came preinstalled DOS. i tried to install the windows 7 ultimate 32 bit. and i installed successfully. But some problem arose i guess the reason is that i created 3 partitions while installations and from Disk Management i created another volume. of the remaining unallocated space.
now when i started the lappy m not able to BOOT. its just the blank screen with a blinking curser. i have tried many times but failed. people please help me solve this problem. its a new laptop and m no even able to start it even once.
secondly. someone suggested me to delete the partitions while instaling the Win 7 again. i tried that too.. but all the options to delete, format, new, are in gray. i mean m not able to delete those 4 partitions.
everything is in front of u. i joined the form with a gr8 hope.. i hope u will help me sorting this out
P.S : i m noob

Is your new Laptop under Warranty?