Ive had my laptop for almost a year and now its saying no bootable device. what do i do?

i love my MacBook Pro it my life. But the other day i was playing Sims three on it and i put it outside so i could cook dinner and it shut off and now its say no bootable device-- insert boot disk and press any key. I went to bestbuy and talked to the geek squad and another kid that has a mac and told me to put in the boot up diskbut he also said that i will loose everything on ther and i cant i have all my school things on there and it cant be deleted. help lexie

Hi Lexie,
Try these steps
When the grey screen appears when you first switch on the mac, hold down the alt key straight away until a hard drive icon pops up. If this doesnt work step 2
Insert the mac install dvd into your mac when the mac is on, dont worry it can be on the grey screen. Then restart the mac with this disk in the drive and as soon as the grey screen pops up hold the "C" key, this will boot from the disk drive. After a period of time a menu should pop up asking to install mac, but dont worry about this. Just goto the menu bar at the top and find startup disk. Once you are in there select the Machintosh HD or which ever your drive is called, then select restart. This just resets the startup disk. If this fails step 3
When you turn the mac on hold Command+Option+P+R before the grey screen appears and hold this until the mac restarts and gives you 3 beeps. Then let go and it should work This command just resets the PRAM and NVRAM which is just a small part of memory that holds simple information such as the startup disk.
All of these steps will not make you reinstall anything or damage any of your data.
Good luck!

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