My Ibm laptop won't start and only displays a message what should I do?

When I turn my laptop on it only displays a message and never starts this is the message it displays.....

Broadcom Undi PXE-2.1 v7.7.5
copyright (c) 2000-2004 Broadcom corporation
copyright (c) 1997-2000 Intel corporation
All rights reserved

Broadcom base code PXE-2.1 v1.0.1
copyright (c) 2000-2004 broadcom corporation
copyright (c) 1997-2000 Intel corporation
PXE-E61: media test failure, check cable
PXE-M0F: exiting Broadcom PXE.
Operating system not found