The Blackstone Group has withdrawn from the auction of ATM maker NCR, marking the second time this year the company has failed to come to terms with a potential buyer, The Post has learned.

“Nothing is going to happen,” a source said. “The process is over.”

The Post reported earlier this month that NCR had re-opened sale talks with Blackstone after an earlier auction collapsed. Buyout shop Thoma Bravo made a roughly $31 a share offer for NCR in July that the company rejected, sources said.

NCR shares, which had dropped 20 percent in the past year, fell 7 percent to close at $26.74 on Tuesday.

For months, the Duluth, Ga.-based company has been under pressure from shareholders to boost its share price. Hedge fund Marcato Capital Management called on NCR last year to explore options, including a sale.

Blackstone declined comment. NCR did not return calls.