troubleshooting checklist and some BIOS-related tips tailored for your Gigabyte B360M DS3H

 Here’s a practical troubleshooting checklist and some BIOS-related tips tailored for your Gigabyte B360M DS3H that will help you deal with a “no signal on monitor” scenario — especially useful after powering on via a PS/2 keyboard or dealing with odd startup behaviour.

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✅ Step-by-step checklist

1. Power down fully & unplug

   • Switch off the PSU, unplug the power cord.

   • Press and hold the front panel power button for ~15-20 seconds to discharge residual power.

   • This ensures you’re doing a “cold” start rather than a warm boot.

2. Check video connection

   • Ensure the monitor is set to the correct input (HDMI, DisplayPort, DVI) that you are actually using.

   • Verify the cable is fully seated and not damaged. Try a different cable if possible.

   • If you have a discrete GPU and also the iGPU (integrated GPU) ports, test both: sometimes the system may attempt to output via one port while your monitor is connected to the other.

3. Ensure GPU/iGPU is selected correctly

   • In BIOS: under Settings → Peripherals / Chipset / Integrated Graphics, verify that “iGPU” (integrated graphics) is enabled if you’re using motherboard output.

   • If you have a discrete graphics card but are using the motherboard output, try switching to the GPU output instead.

4. BIOS reset / CMOS clear

   • With the unit unplugged, you can reset CMOS by removing the CR2032 battery for a minute or using the clear-jumper if present.

   • Then plug back in and see if it boots normally. Good for clearing odd states caused by firmware or hardware changes.

   • The official Gigabyte troubleshooting guide includes this step:

     “Turn off the power. Remove all peripherals, connecting cables, and power cord etc.” GIGABYTE

5. Re-check hardware seating

   • Ensure RAM modules are firmly seated in their slots. Try single-stick in the correct slot if needed.

   • If using a GPU, ensure it is properly seated, and if it requires extra power connectors, ensure they are plugged in.

   • Remove all non-essential peripherals (USB devices, extra drives) and see if the system boots with minimal hardware (CPU, RAM, motherboard, monitor connection) because this isolates other possible faults.

6. BIOS setting checks for display & boot

   • In BIOS → Settings → Power → ensure “ErP” or “Deep Off Mode” (or similar) is Disabled if you want full functionality of wake/auto-power etc.

   • Ensure your system is set to boot with the correct video source (if BIOS has “Primary Display” or “Initial Display Output” option) so that the correct port is active early on.

   • After switching PSU off/on, if the system doesn’t produce a BIOS splash or monitor signal but appears to power (fans/LEDs), the board may be stuck in a hardware initialization loop. A BIOS update may help.

7. Monitor for patterns

   • Note when “No Signal” happens: only on first boot after PSU switch, only after PS/2 keyboard wake, only after power outage, etc.

   • If it happens only after certain actions (like using PS/2 keyboard to wake), then the wake method or initial bootstrap may be interfering with video initialization.

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🔧 Additional BIOS/firmware recommendations

• Update to the latest BIOS version for your board revision (rev 1.0) from Gigabyte’s support site. Newer BIOS often improve POST and video initialization stability.

• Once BIOS updated, clear CMOS and re-configure your settings (AC Back, Wake on LAN, keyboard wake, video priority).

• After BIOS update and resetting, perform a clean shutdown, then power on with monitor connected and verify you get the BIOS splash before loading Windows — this confirms the display output is working at the earliest stage.

• If you continue using PS/2 keyboard to power on: make sure the PS/2 port is being used (not USB) since PS/2 wake is more reliable on older motherboards. USB power-on may not always work in “off” or “standby” states depending on the board.

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If you like, I can pull up the exact BIOS screenshot section from your board’s manual (page number + label of each relevant option) so you can visually identify the settings when you reboot.