Intel has issued a comment concerning the iPhone sync issues some users are experiencing with certain PCs containing a specific Intel chipset. “Our leading theory is a BIOS or system configuration issue, but we are still investigating,” Intel said. The basic input/output system (BIOS) is the boot firmware run by a PC on startup, which identifies, tests, and initializes core system devices such as the graphics card, hard disk, and other hardware. As we reported earlier this week, the syncing issue appears to linked to Intel’s P55 Express chipset and its USB controller, which leaves the afflicted machines able to recognize the iPhone but unable to sync. The problem has been most prevalent among PCs running 64-bit Windows 7, but the issue has also been reported on machines running both 32-bit and 64-bit versions of both Windows 7 and Vista.