My satelite C50-a483 boots to bios only.

I am using satelite C50-a483. it is running win 8.1. it was working perfectly. once i started, it boots to bios without initiating.... i didn't even come to any keys. i didn't  change any preference in bios. i restarted , but it brought back me to bios.  i can see HDD in boot device option. but it doesn't boot to OS. it boots to bios always.....!!! What's the problem  ? Note: Secure boot is enabled. i didn't touch any preferences in boot settings.......... 

but i am facing this error when i connect HDD to desktop.... The black screen reads the following:
Intel UNDI, PXE-2.1 (build 083)
Copyright (C) 1997-2000 Intel Corporation
This Product is covered by one or more of the following patents:
US5,307,459, US5,434,872, US5,732,094, US6,570,884, US 6,115,776 and
US6,327,625 media test failiure ... exiting

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