I built my first PC and successfully entered the BIOS during the initial boot. I only changed a few fan settings and enabled EXPO 1 for the RAM, then shut the computer down because I hadn't installed Windows yet. The next morning, the PC powers on, but I can't get back into the BIOS. What should I check, and how can I reset the settings if EXPO caused a problem?
3 Answers
Try repeatedly pressing Delete, F2, or sometimes F10 immediately after turning the computer on. If you’re using a wireless or Bluetooth keyboard, switch to a basic wired keyboard plugged directly into a rear USB port, since some boards don’t initialize wireless keyboards early enough.
First figure out what you’re actually seeing: a black screen, a “no signal” message, or the system booting normally. Check whether the monitor cable is connected to the graphics card or the motherboard, and try the other output if your processor and graphics card both support video. Also check the motherboard’s debug LEDs for CPU, RAM, or VGA errors.
Since EXPO changes the memory settings, the system may be failing memory training. Clear the CMOS and restore the BIOS defaults. Depending on the motherboard, you can use the clear-CMOS button or jumper, or remove the CMOS battery with the PC unplugged and follow the manual’s timing instructions. Then boot with the default settings and try enabling EXPO again only after everything is stable.
The motherboard is a Gigabyte X870, the CPU is a Ryzen 7 7800X3D, and the only BIOS changes were fan settings and enabling EXPO 1. I didn’t manually overclock anything.