Acer H81h3-am V1.0 | Manual

This is often a RAM seating issue or a failed CMOS battery. Reseat RAM, clear CMOS, and ensure the monitor is connected to the correct port (if using a discrete GPU, do not use VGA/HDMI on the board).

| Symptom | Likely Cause | Fix | |---------|--------------|-----| | No power, fans not spinning | PSU dead or front panel header miswired | Test PSU with paperclip; rewire Power SW pins 6 & 8 | | Turns on, no display | RAM unseated or incompatible CPU | Reseat RAM; test with known working stick | | USB 3.0 ports not working | Missing driver in Windows | Install Intel USB 3.0 driver for H81 | | CMOS checksum error | Dead battery (CR2032) | Replace battery; re-enter BIOS | | Boot loop after CPU upgrade | BIOS too old for Haswell Refresh | Reinstall old CPU → update BIOS | | No audio from rear jacks | Realtek driver not installed or front panel detection enabled | Disable front jack detection in Realtek console | Acer H81h3-am V1.0 Manual