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NEW YORK ( TheStreet) -- Is it time to start betting on some high-profile tech turnarounds? Jim Cramer told his "Mad Money" TV show viewers Tuesday that after despising names such as Groupon ( GRPN - Get Report) and Nokia ( NOK - Get Report), it may be time to change his tune. Cramer said he never liked Groupon, the over-hyped online coupon Web site that's done nothing but disappoint the markets since its IPO. But when the company's CEO stepped down earlier this year, that signaled a big change, one that Cramer admitted he didn't take seriously. He advised investors to stop selling Groupon back in February, but never told them to start buying, which turned out to be a mistake. Cramer said the time to buy Groupon is now. But what of Zynga ( ZNGA - Get Report), the online game maker whose stock has followed Groupon's path hopelessly lower? Here, too, Cramer said a new CEO makes all the difference and he feels it's not too late to begin buying into this turnaround story. Then there's Nokia, the beleaguered phone maker that everyone assumed Microsoft ( MSFT) would acquire. Cramer said now that Nokia bought Siemens ( SI) out of their joint venture, the path may now be cleared for that acquisition to happen. With little downside remaining, Cramer said he'd be a buyer here as well. Finally, there's BlackBerry ( BBRY). Cramer said unlike Groupon and Zynga, BlackBerry's CEO has done little to turn the company's fortunes. He said without splitting itself up or getting acquired, he sees little hope for BlackBerry's current strategy and is therefore not a buyer.