As much as I hate to say it, the answer is that he doesn't have any emotional connection to his laptop, which means he can't find it or influence it. Note that he also rules out writing a message in the books or somehow mucking around with lander.
“‘They’d have access to infinite time, infinite space,” he told Tars, gesturing all around him. “But no way to find what they need. But I can find Murph and find a way to tell her—like I found this moment…”
“How?” Tars asked.
“Love, Tars,” he said. “Love, just like Brand said. That’s how we find things here.” Love, like gravity, which could move across time and dimensions.
Brand had been spot on.
“So what are we to do?” Tars asked.
Cooper looked down the time dimension. The books? No, and not the lander. But the watch, on the shelf, as far as he could see…
“The watch,” he realized. “That’s it. She’ll come back for it.” - Interstellar Novelisation