Officials with the Prince George's County hospital system in Maryland said that they had not received the first installment of state and county money that was promised under a new law. According to the law, intended to prop up the troubled system while a new buyer is sought, the state and county will each give the system $12 million a year for the next two years. Meanwhile, a seven-member panel will accept bids from healthcare companies interested in buying the hospital system. The law requires that the county and the state provide the funding in installments at the beginning of each quarter of the fiscal year. The first quarter of this year began July 1.