Black Screen and White Font with PXE Errors

I am not so highly developed with IT and its sector. Anyway, I’m just searching for a few simple help or ideas. I got a 6-months old HP Bell laptop; it was running very well and reboots just fine. But now, I find the following error with a black screen and white font when I try to use it.
“PXE-E61: Media test failure, check cable
PXE-M0F: Exiting Broadcom PXE ROM
No bootable device – insert boot disk and press any key.”
I need your help to solve this. Thanks a lot.
