When the battery is removed is there any sticker showing a model number?
If the BIOS says the primary hard drive does not exist, that is the reason for the "No boot device found error". What I do not understand is how diagnostics passed both drives when BIOS can only see one.
(Edit: See if there is a setting in BIOS that controls the primary and secondary SATA ports. Also, if you can access it easily, remove the CMOS battery and hold the power button down for 10 seconds with the power adapter unattached and the battery removed). This will reset the BIOS setting and possibly let the primary drive be detected.
The hard drive may have failed or maybe it's motherboard related. Taking out the primary drive and attaching it again may let BIOS will detect it. You could try swapping the drives. If BIOS detects the drive in the primary slot and not the secondary, then you know the hard drive has probably failed or you could take it out and attach it to another computer to confirm it.
Before doing any of the above, unplug the power adapter and battery. Ground yourself on any bare metal on the computer first and avoid any contact with the hard drive circuit board. You should have a drive cage which will protect the drive somewhat.
If you had an external hard drive or even a flash drive it would be possible to transfer your most important files from the data drive using the linux distro. For this I recommend Puppy because it is a small download. If you decide to do this, download version 5.2.8 and burn the iso file. If you have a Windows 7 computer, just double click the iso and burn to disk. Boot the Puppy disk. Your data drive will appear in the lower left of the desktop. Clicking once will mount it and open the File Manager. Attach the USB flash or external drive. A USB icon will appear next to your CD drive. Click once on that and another File Manager windows will open. You can select multiple files and folders by holding Ctrl and left clicking. Drag from one window to the other and Copy the files, not move. See this helpful guide. You should not do the disk check as shown on page 2 of the guide.
Edited by JohnC_21, 15 July 2014 - 07:09 AM.