Window 7 Hard Disk Problem

Tech Support Guy System
OS Version: Microsoft Window 7,
Processor: Intel(R)

RAM: 3 gb
Graphics Card: Intel(R)
Hard Drives: C: Total - 160 gb, Free Space - 100GB;
Motherboard: Lenovo ,Y-410

When I start my lenovo laptop these error find:
1.PXE-E61-Media Test failure,check cable

2.PXE-MQF:Exiting Broadcom PXE ROM.

3.operating system not found.

Suggest me what to do: