Operating System not found

Hello SevenForums, today I've had a problem with my ACER Laptop, and I need help fixing this Black Screen Of Death. I started up my laptop today, and BOOM! An error popped up and I have no absolute idea how to fix it.

Code:

Intel UNDI, PXE-2.1 (build 082)
Copyright (C) 1997-2000 Intel Corporation

For Realtek RTL8101E/8102E PCI-E Ethernet Controller v1.09 (080602)
PXE-E61: Media test failure, check cable
PXE-M0F: Exiting PXE ROM.
Operating System not found

Lots of help is much appreciated!
Thanks.

Bump, really impatience.

Looks like it's trying to boot off the network. Did you change boot order in bios? Disable valid boot media?

Yes I have, my boot tab is this exactly;

Code:

Boot priority order:
1: IDEO:
2: IDE1: Optiarc DVD RW AD-758OS-(S
3: Network boot: Realtek Boot Agent
4: USB HDD:
5: USB FDD:
6: USB KEY:
7: USB CD/DVD ROM:

Your hard drive is missing from that list.

How would I get it there, and how did it disappeared? Because my computer was working the day before this has been happening.

The way you responded in post #4 leads me to believe that you made changes to your BIOS. If so, you need to go back in there and find the page/option/dialog that allows you to re-enable the hard drive for booting. Without being able to view your BIOS screens or knowing more details about your machine there's really no way I can tell you exactly how to go about gaining access to the right place.

Looking at your boot order again, looks like your hard drive might've been first in the list at IDE0. If you didn't change anything in the BIOS, and didn't remove your hard drive, I'm afraid you may have a failing/failed hard drive. You might open it up and check the drive itself to ensure it's still properly connected.

To supplement the advice given by sibbil:

• The first thing to check is whether the hard disk is physically connected to the motherboard properly. To do so:
  • Shut down and turn off the computer
  • Remove the AC Adapter
  • Remove the battery
  • Hold down the power button for 15-30 seconds to close the circuit and drain any residual power
  • Remove the panel on the underside of the laptop where the hard disk is housed
  • Remove and re-insert the hard disk by sliding it away from the connector and then gently but firmly pressing it back into the connector (no screws should need to be removed to do this step)
  • Replace the panel on the underside of the laptop to cover the hard disk
  • Replace the battery
  • Replace the AC Adapter
  • Turn on the computer and see how it responds
  
  Post back once these steps have been implemented whether the system is stable. Sometimes these crashes can occur due to a loose connection.

In addition to the excellent advice to check connections, I would recommend going into your BIOS, and select Load Setup Defaults under the Exit Screen. Hit Enter. Then select Save and Exit, and hit Enter again.