Toshiba Satellite M305D S4831 PC Notebook

Question

My computer worked well for about 6 weeks.  Here is the error message I receive when I turn on my NEW computer:

Yukon PXE v6.50.2.3 (20071025)
(C)Copyright 2003-2007 Marvell(R).  All rights reserved.
Pre-boot eXecution Environment (PXE) v2.1
(C)Copyright 1997-2000 Intel Corporation.
PXE-E61:  Media test failure, check cable
PXE-M0F:  Exiting PXE ROM.
Operating System not found

Can you help?