Intel is investigating a flaw that affects people trying to sync their iPhone with a PC that has an Intel P55-based motherboard and 64-bit version of Windows 7. The inability to synchronise iTunes with iPhones on such configurations was first flagged up on an Apple support forum in mid-September. Some posters said they had been able to mitigate issue by downgrading iTunes from version 9.0.2 to version 9.0.0. According to Intel, problem may lie in P55 chipset's Basic Input Output Software (BIOS), set of instructions that’re run when a computer starts up. These instructions check that PC's components’re all present and in order, so computer can run properly. "Our leading theory is that this’s a BIOS or system configuration issue, but we’re still investigating," Intel told.