Issues with CPU cores
Issues with CPU cores
Your system shows conflicting processor information. The task manager lists two logical processors, while the device manager displays four. The BIOS indicates four enabled cores, but only two are active. In msConfig you can only configure it for two. This suggests some cores may be inactive or reserved. Motherboard model B85M D3H Rev2 with FD BIOS is compatible.
Sometimes task manager behaves unpredictably. Try installing CPU-Z and verify its display.
Update your BIOS settings back to the original configuration. Their latest updates mention changing the CPU from a Pentium dual-core model to an i5, but they encountered some boot issues, suggesting a possible compatibility problem.
Open msconfig, remove the number of processors, restart, issue resolved.