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Board Start up problem at 1st time in the system

HI

We are using bunch of TPS and LMH series ICs in our board to power Processor and other circuit.

"The board works fine."

The observed issue is with the Card Booting.

When board is placed in the system with other boards, for 1st time when system power is ON, our board is not booting, where as for 2nd and 3rd time and even further the board is booting normally. It will boot normally n number of times except 1st time in the system.

Also "When the board is tested independently it boots every time including the 1st power ON."

what could be the issue?

Regards,