Sir ,i have acer aspire 4520 laptop .when i boot my laptop it will show message below pxe-e61 media test failure ;check cable existing nvidi boot agent and my laptop loss display for sometime & again gain display . i have shown my laptop to acer service center they told its motherboard problem .so,sir please tell me problem & its solution

Definitely a hard drive failure, pull the hardrive out if its no longer under warranty(the pc) and you can get hard drive tested kits that allow you to hook up the hard drive to a working pc and test the hard drive for errors, some are so fried they wont even read. The chirping sounds sounds worst case scenario. But it is deffinately a hard drive failure.

It is trying to boot from the network, basically from the internet cable that can be plugged in. If you enter the bios you can typically disable the PXE boot option so it won't show up again.

Please read here:
http://www.computerhope.com/issues/ch000706.htm

http://www.nocrash.com/ncbbs/msgs/3457.shtml

http://en.community.dell.com/support-forums/disk-drives/f/3534/t/3726795.aspx

http://hubpages.com/hub/How-to-Solve-PXE-E61-Media-test-failure-Check-cable-Error

You may have hard drive problem or setting in the BIOS.

It is trying to bbot up using network boot because it cannot find OS on the hard drive, you can turn off the network in the BIOS setup page, but more likely you have problem with the hard drive or the OS is corrupted.

Sounds like you wiped out the harddrive try reinstalling the os if that does not work you may ned a new harddrive

PXE-E61: Media test failure, check cable (of the HARD DISK pls)

pls first check the hard disk seated in the bottom left side of ur notebook u have to take out the 7 or 8 screws first and then take take it out by pulling the connector gently and try to re seat or re fit the hard disk so connector can seat firmly in hard disk and then power up ur notebook if Error persists

then sorry to tell u my friend that ur Hard disk has CRASHED and not giving up files for OS loading kindly replace ur HARD DRIVE and restore ur OS thru backup disk u got

Pls take care of ur notebook from bumps and falls and hard impacts during operation and carrying bcoz the disk inside the HDD is very sensitive and gets damaged easily by impacts

pls rate me FIXYA for my diagnosis

Your hardirve is damaged or your partition is corupted to fix this problem reinstall windows and make a new paetition or check inside your computer to see if a cable from the hardrive is desconnected.

your e-machine is set to boot from the network (PXE = Netboot)

go to your BIOS and make sure you boot from your hard drive

Not always the Hard drive, boot into the bios setup utility and de-select network bootfrom the boot options. If it tries to network boot first you will always get that failure.