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Your computer tries to "boot" from several devices:
* floppy disk
* CD/DVD optical device
* external CD/DVD
* USB memory stick
* PXE ("Pre eXecution Environment)
To use PXE, you need "media" -- a network cable connecting yur computer to a "boot-server". The "media test faiure, check cable" reports that no network-cable exists, or that it does exist WITHOUT being connected to a boot-server.
Probably, your computer failed to boot from a DEAD disk-drive, and then tried floppy/CD/USB before checking PXE.
Dissconnect all USB connections and maybe the hard drive and cd drive.
If this does solve the problem, then put them back in one by one to see where the fault is.
Replace the faulty item.
If not, the take it to the shop and get it repared
This depends on what devices you are using but usually you MUST install the drivers FIRST before connecting anything to the USB sockets so uninstall anything you have previously and start again installing the drivers FIRST before you plug it in.