The back-ground status check by the ex-prospective-employer will in no way affect your profile. BUT do make it a point that if you are unable to report for joining on a given date, make it known to the employer well in advance (with some valid documents, if needed) of your inability to so. Further, if you decide, not to take-up the job offer, again inform the organization with a courteous polite note, maybe adding the reason why you refused the offer.
Never burn bridges
Arif ur Rehman
I agree with opinion of Mr KK & Mr Nathrao.
At the same time this can not be ruled out that interviewer may recognise you. To tackle the situation you should remain ready with a positive reply, why you did not join on last ocassion even though considered for the post.
You have not done anything illegal, immoral, unethical & incorrect, it was perfectly within your authority to join that company or not. By not joining that company you exercised your right to choose your employment. T.his does not form part of your professional back ground
Back ground verification happens of the professional background and also some times personal back ground, if your personal record is clean, you do not have to worry about anything and enjoy your life.