My ACER Aspire 5100 does not start and show a message For Realtek RTL8139(X)/ 8130/ 810X PCI Fast Ethernet Controller V2.13 (020326) PXE-E6111: Media Test Failure, Check Cable. PXE MOF: Exiting PXE ROM. How to solve the problem? Should I go to set up at the start and apply restore default configuration?

It is beacuse your Hard drive is not detected on the computer properly.
Try resetting BIOS.
If that doesnt work, Check whether your hard drive is good.

try downloading from here

http://pci-ven.com/driverdetector/realtek/rtl8139realtek/realtek-rtl8139-x-8130-810x-pci-fast-ethernet-controller-v2-17-051202-.html

good luck

The error message means that your system is trying to boot from LAN ie... Network boot enabled in your BIOS.

Since the system can't find any where to boot from. It is restarting.

Also probably your bootloader on the harddrive is corrupt. Please reinstall the operating system using a CD/DVD.

disable the lan boot in bios and make ur first boot device as cd dvd or hdd

Hello.

That error message usually refers to a hard disk failure. Your hard disk cable could be loose or faulty. Or, your hard drive would need to be replaced.

I'd suggest to check the cable and run your system's hardware diagnostics (often F2 or F12) when your system boots.

Hope this helps.

You most likely have a bad NIC card. Purchase a USB or PCMIA ethernet card, install and you'll be ready to go!

thats ethernet card realtek
did you check to see hard drive is securely in tack
saying can't find os
you may need to do a new install let me know
if you took apart you made have caused hard drive to become lose

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I had the same problem with this one I first replaced the hard drive and I would get jibberish in the bios menu under hard drive like afhjga000000094234;;;;''''''' <-------- Thats what my bios would detect under hard drive
I just replaced the motherboard and that fixed it

go buy a new hard drive the hard drive has failed,,,,then use the restore disk and restore your machine...the reason it is going to the ethernet controller is that since the hard drive has failed it tries to access the next bootable device...and none is present