Acer desktop Aspire X5900 can't boot,

Hello,

My computer was crushed and auto shutdown. I tried to put out/in the CMos, but it didn't help. I tried to press Alt+ F10 and do e-recovery as I don't have CD . Via HDD , it give me message ..------
Reboot and select proper Boot device or
Insert Boot Media in selected Boot Device and press a key.--------
After that not working and i had to force shut down the computer.
I tried pressing F8 upon Acer logo screen. But nothing came out.

Just in case, I am using window 7, wireless keyboard and mouse, during trouble shooting, I use wireless senson on system unit. 1year warranty was expired 6mths ago.
Please advise, thank you so much in advance.