[ts-7000] TS-7400 hang on boot up before loading kernel

[" [ts-7000]" <>]

My TS-7400 board is getting hang/freeze while booting up.
It just display 

>> TS-FLASHBOOT - built Jan 26 2007
>> Copyright (c) 2007, Technologic Systems
.
.
.


Nothing more ...................

keep waiting ...........
It dont return to prompt
like
Finished booting in 1.92 seconds
Type 'tshelp' for help
$ exit
I did possibly done an wrong operation , messed up with linuxrc script which can redirect booting to SD card.

 ln -sf /linuxrc-flashboot /linuxrc; saveAfter this unit has got non-working with stuck in above message.

I did prepared SD card with fastboot image but looklike due mess up with /linuxrc script I am unable to boot from SD card.

I dont have TS-9441 with me to recover this using boot jumper.

TS-7400 is not responding to any telnet, ping command while in this state.

Can you suggest some method to recover from this.
Can I do it with SD card method while my board is non-responcive?

Please guide me

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