A 28-year-old Loudoun County man was listed in fair but stable condition last night after what he said was a severe beating early yesterday by a cell mate in the county jail, where he was being held on a drunk driving charge.

David L. Campbell, of 78 NE Adams Dr., Leesburg, was being treated at Leesburg Memorial Hospital for a punctured lung and two fractured ribs that he said he sustained when he asked a cell mate for a cigarette and the other man "just went off" and began punching and kicking him.

Campbell said the beating, which he said occurred around 2 a.m., lasted between 10 and 15 minutes and that his repeated cries for help brought no immediate response from several other men in the cell or from sheriff's deputies in the jail.

"They didn't try to stop it. I was hollering for help, but they didn't try," Campbell said from his hospital bed in a telephone interview yesterday. "I wanted somebody to get that crazy man off of me because I couldn't get up."

Campbell also had a cut over his right eye that required 10 stitches.

Sheriff's department officials yesterday confirmed the incident and said an investigation was under way. But they declined to comment further and would not identify Campbell's assailant or say whether any charges had been filed.

Campbell, a foreman with Asplundh Tree Co., said he was arrested Saturday afternoon by state police after he was stopped in his car on Rte. 15 in downtown Leesburg. He said he was placed in the cell to await a court appearance on charges of driving under the influence and driving with a suspended permit.