This yellow exclamation mark usually appears after installing Windows 10 on an DH55PJ. It's for the Intel Management Engine (ME) interface, which isn't critical for gaming or daily use.
Driver sources and verification (advice) intel dh55pj drivers for windows 10
: Supports LGA1156 socket processors, including 1st and 2nd generation Intel Core i7, i5, i3, and Pentium models. and Pentium models.