Windows 7 - Can't Boot Computer (Media Test Failure)

Yesterday while watching an online baseball stream and simultaneously browsing facebook, my computer randomly gave me an error message. Unfortunately I don't remember what the message was about. What I do remember is that I immediately opened a new firefox tab and searched up the error. I clicked on the first link, and the OP was talking about how he had received the error and shortly after, his computer shut down. Almost on cue, my computer crashed and restarted itself.

Ever since then, I can't boot up my computer properly.

I turn on the computer, I see the first two screens that I always see (BIOS screen and then the 'Detecting eSATA drives' screen). After this it goes to the third screen, which I also always see. But this is where the problem is.

First it loads all that code crap that I never understand. Then, like always it gives me these two lines: 'Verifying DMI Pool Data....'

And then 'Boot from CD'. This always happens. But regularly from here it just boots up and goes to the Windows loading screen.

Now, on the same screen, it starts giving me error messages.

NVIDIA Boot Agent 253.0543
Copyright (C) 2001-2008 NVIDIA Corporation
Copyright (C) 1997-2009 Intel Corporation
PXE-E61: Media test failure, check cable
PXE-M0F: Exiting NVIDIA Boot Agent

NVIDIA Boot Agent 253.0543
Copyright (C) 2001-2008 NVIDIA Corporation
Copyright (C) 1997-2009 Intel Corporation
PXE-E61: Media test failure, check cable
PXE-M0F: Exiting NVIDIA Boot Agent

NVIDIA Boot Agent 253.0543
Copyright (C) 2001-2008 NVIDIA Corporation
Copyright (C) 1997-2009 Intel Corporation
PXE-E61: Media test failure, check cable
PXE-M0F: Exiting NVIDIA Boot Agent

NVIDIA Boot Agent 253.0543
Copyright (C) 2001-2008 NVIDIA Corporation
Copyright (C) 1997-2009 Intel Corporation
PXE-E61: Media test failure, check cable
PXE-M0F: Exiting NVIDIA Boot Agent
DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER

That's exactly what I get.

Before, I was also getting the error message 'PXE-E53: No Boot Filename Received' prior to the media test failure message. After I unplugged and replugged my internal hard drive (some forums were saying to check the cables for the hard drive) the first error dissapeared.

I have a Windows 7 Ultimate 64-Bit OS. I bought the computer second-hand off a guy who was selling it online. He didn't have any of the CDs, so my copy of Windows 7 is burned (though I do have the CD still).

Before yesterday it was working fine.

All I want to do is to be able to get into the computer (Hard Drive) once, so that I can backup all my files and then I'd reinstall Windows 7 from scratch.

Does anybody have any idea how I can fix these errors, or at least somehow get onto my user account? Any help would be greatly appreciated.

Additional Info:

I tried to run the installation disk.

The first option in the recovery package said that it would look for repairs, and once it was done told me to restart the computer. Didn't fix anything.

I can't do a System Restore because I can't select my operating system, and I cant revert to an older System Image because apparently I don't have any.

This means your computer boot order is messed up or your hard drive has gone bad and it's trying to boot from the network.

You should be able to disable network boot in BIOS Setup.

While there, check the Boot Priority/order/sequence.
Also check to see if your hard drive is being recognized any more.

Sorry I forgot to point that out. Hard Drive is recognized in the BIOS, I also checked the sequence already. First I used my computers settings which were 'Hard Drive, Hard Drive, Nothing'. I don't know why it was like that, I only have one HDD. Then I defaulted the settings, tried that, didn't work. Now I've put Hard drive as the first option in the sequence again and it hasn't made a difference.

I don't believe Network is in the boot sequence.

Could it be possible at all that this was caused by a virus? Because those stream sites had a lot of pop ups and ads. I'd much rather it be a virus than a hardware problem, though both ways I really don't want to lose my data.

Very unlikely a virus will affect your BIOS.

Try this.

Power down
Unplug power cord
Open computer case and remove the CMOS RTC battery (about the size of quarter)
Press and hold the power button for 10-15 seconds. This allows all capacitors to drain
Put the battery back, plug the power cord in and power up

You should get a CMOS checksum error and a press f1 to continue f2 to enter setup message.
Press F2.
Load defaults, set date/time, check all other settings, save and exit.

See if that helps.

I couldn't find anything like that in my computer. Maybe it's there but its covered up by something? Is that possible?

Because I have two nVidia GTX 260 Video Cards, a Corsair 850W Power Supply and an extra fan cooling system, all of which are pretty big things. The motherboard is an EVGA 780i.

All computers have the CMOS battery. It may be behind something but it's there.

Is this your board?



Red arrow points to the CMOS battery.

I'm pretty sure that that's what my board is, and I had a feeling that that silver circle was it (though I only saw it in pictures).

I have a video card on the bottom green slot, and I think it's covering up the CMOS battery. I don't know exactly how to unplug the video card.

Okay so I guess my motherboard ISNT the 780i. Though it looks exactly like the one in the above picture, after taking out my video cards, the CMOS battery is in a different spot than where it is in the picture.

Okay I did what you said, got the cheksum error, went into setup, loaded defaults, saved and restarted. But now on the screen that I got the cheksum error, now there's a 'Floppy disk(s) fail (40)' error.