Blackstone pulled out of bidding for Dell amid concerns about the computer maker’s finances and the worsening outlook for global PC sales, sources said.

The world’s biggest buyout firm made a non-binding offer to acquire Dell last month, rivaling a $24.4 billion joint bid by founder Michael Dell and Silver Lake Management, the largest proposed leveraged buyout since the financial crisis.

Enthusiasm waned as global PC sales fell the most on record in the first quarter and a closer look at the company’s financials revealed a gloomy outlook for revenue, sources said.

Unlike Silver Lake, which has a significant Silicon Valley presence with an office in Menlo Park, Calif., Manhattan-based Blackstone doesn’t have a technology-focused investment record and views the deal as a riskier turnaround project, said one of the people familiar with the situation. A Silver Lake spokesman declined to comment.

Global PC sales plummeted 14 percent in the first quarter, as buyers opted for smartphones and tablets, IDC reported last week.

Blackstone has offered to pay at least $14.25 a share to current investors with an option to hold onto some of their stake through a so-called equity stub. Billionaire Carl Icahn offered $15 a share in cash for as much as 58.1 percent of Dell’s stock.

The Dell-Silver Lake deal would be a straight all-cash buyout of the shares Michael Dell doesn’t own for $13.65 a share.

Shares fell 2 cents to $13.95 yesterday.