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

Gomez, October 2009

I would take it to a computor doctor - the messages clearly say that there appears to be a cable problem and that the operating system can't be found - perhaps it's the cable to the hard disk at fault.

Peccavi, October 2009