The Bios keeps change the setting every time I start up my laptop!

My laptop is satellite L500, Bios v 1.9 
the problem is every time I start the computer the bios changes the setting and tries to boot from the LAN.
when I press F2 and go to boot section I only found the CD, FDD and LAN, I found no HDD tab!
so every time I have to load the default configuration and restart to access the OS!
any idea how to fix this problem?
for your info I've bought this laptop only 4 months ago - so I believe the Bios battery is fine- it was working normally but about one month ago this problem started .
Thanks in advance

Can you get into the OS?  
Normally when you go to the boot menu (F12) there should be a Hard disk option.  If it is not listed then you possible have a bad hard disk.  When the hard drive is not seen it will try to boot to the next boot option, in this case the LAN.  

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