Ma last August ma US aaipuge in DV1. Ma Boston ko Logan Intl Airport ma land gare. Immigration ma sab check up vai sake pachi tiniharule mero passport firta diye. Ma chai kehi check nagari hat ma passpost liyera niskiye....

Yo mero first international flight thyo.... malai tha thiyena k k hunchha vanne.. mero passport ko tespachi malai jaruri parena kinaki I got my GC and SSN in just few days ... Ahile aayera maile mero passport check garda po tha vayo ki US immigration ko kunai stamp nai chhaina mero passport ma.... 
Aba maile K garnu parla?? malai Nepal gayera aauna kehi problem hunchha ki nai?? If I have to put stamp how can I do that?? 
Ramro jawaf ko aasa garchhu....

 It looks like TSA person forgot to stamp on your passport, but don't worry he had not forgotten to put that on the database otherwise u wouldn't have gotten ur GC and SSN.

 and you can always contact the airlined to get a proof that you were on the flight. Get the papers from airlines and you'll be all set

 You should go to the nearest CBP office (custom border and protection) and get it fixed. Keep your boarding pass, however, to prove when you actually arrived.

oh shit.....you are a dead man!!!! now they will hunt you down and kill you....cut you into pieces and feed the dog...run bhaire ...run

Sustasuman,

You will be fine. I had the same problem in summer 2006. I was in F1 visa. I traveled outside US after that and came back in, no problem at all.