Issue with PC not starting BIOS despite USB connections? Screen remains off.
Issue with PC not starting BIOS despite USB connections? Screen remains off.
Hi!
I'm facing issues with my new PC. When I power it on, I only see a black screen and can't access BIOS. However, removing all USB devices allows it to enter BIOS without problems, and once the keyboard/mouse are connected again, everything works properly. I've tried various keyboards, removed the CMOS battery, but no updates have helped. Thanks!!!
A brief white symbol appears on this device during startup (Ryzen 5600X on MSI MAG B550 Tomahawk) for a short time. This is typical on some systems.
I've adjusted the BIOS to turn off the "full screen logo" since I prefer to view traditional BIOS notifications from the SAS controller and a list of all connected drives and SSDs.
If you keep the default "full screen logo" active on certain boards, it prevents you from seeing helpful startup messages. These alerts could contain fault details such as keyboard detection issues.
In older BIOS versions, there was an option to "stop on all faults except keyboard," allowing the system to continue POSTing and loading the OS even without a working keyboard.
If the BIOS identifies any fault beyond the keyboard, it would freeze and show a BIOS error (which might not appear if the full screen logo is on).
Review the BIOS settings to confirm if it's configured to "halt on all errors including keyboard."
There seems to be something unusual with your motherboard. After checking the CPU, RAM, GPU, keyboard, mouse, etc., the BIOS should try to boot the OS. I’d only expect it to freeze if it can’t locate a necessary working part.
Do you have any older PCIe cards installed, such as your LSI HBA SAS controller? Connecting them with their own legacy BIOS could help reveal messages during startup. If the motherboard BIOS is set to UEFI only and Legacy is disabled, third-party BIOS info from other cards might not show, possibly causing a hang. It’s uncertain, but worth considering.
Are all the keyboards you’ve tested USB, or are some Bluetooth-enabled or connected via a 2.4GHz dongle?
There are no PCIe cards installed. I attempted both wired and wireless USB devices without any noticeable differences. The unusual occurrence was that after connecting my older ASUS 1440p monitor, it functioned properly after several tries. In the BIOS I couldn’t locate a “Halt on all errors” setting, but I disabled “Full Screen Logo.” Following a fresh Windows 11 installation, this became confusing. On my main monitor (Samsung U32J590UQU), the system boots directly into Windows without any “Press F2 or DEL to enter BIOS” prompt—it proceeds straight to Windows. Pressing F2 or DEL doesn’t bring it into Windows; instead, a dark gray screen appears. When switching to Monitor 2 (ASUS), I see the BIOS prompt and can access it normally. Another peculiar point: after turning off “Full Screen Logo,” I can view the details on Monitor 2 but not on Monitor 1 (Samsung). One message reads:
USB devices total: 2 KBDs, 1 MICE, 0 MASS, 1 HUB
This is puzzling since I only have one keyboard and one mouse connected. I tried various setups:
• Mouse only: 0 KBDs, 1 MICE, 0 MASS, 1 HUB
• Keyboard only: 2 KBDs, 1 MICE, 0 MASS, 1 HUB
• No devices connected: 0 KBDs, 0 MICE, 0 MASS, 1 HUB
If you're not employing BT or wi-fi, turn them off...check it.
I experienced issues with an old TV connected through HDMI, missing the Del or F2 prompts and being unable to access the BIOS. When switching to VGA on the plasma TV, I could view the Del message and enter the BIOS.
It seems the BIOS might be too slow to recognize monitors via HDMI, possibly causing the time to detect key presses to pass. I believe DVI and Display Port inputs are recognized more quickly than HDMI.
Don't worry about numerous KBD messages—they're likely just there to cause confusion!
when you mentioned it didn't go to bios, do you mean you don't notice the bios display, yet it still launches windows 11?
During startup, the system doesn’t display the BIOS entry prompt unless I press Del or F2 repeatedly. Otherwise, it immediately launches into Windows without entering the BIOS mode.