MR beep codes
MR systems use high (H) and low (L) beeps. The dashed indicate pauses.
- LH – LLL – BIOS failure, replacement required
- LH – HLL: DMA page register failure
- LH – LHL: Keyboard controller self-test failure
- LH – HHL: RAM seated incorrectly
- LH – LLH: Mainboard failure
- LH – LLL: Memory bank 0 pattern failure
- LH – LHLLH: CMOS RAM read/write test failure
- LH – HHLLH: Real-time clock failure
- LH – LLHLH: BIOS/RAM failure with graphics card
- LH – HLHLH: Keyboard controller failure
- LH – LHHLH – RAM parity error.
What is Beep Code?
“Beep Code” is the name for the sound patterns that a computer’s motherboard makes through the BIOS (Basic Input/Output System) when there’s a hardware issue during start-up. These beep codes are essentially the computer’s way of communicating problems with essential hardware parts like memory, video cards, or the motherboard itself.
Each manufacturer of BIOS systems has their distinct set of beep codes, which differ in the number and sequence of beeps, with each unique pattern pointing to a specific type of error.
For example, a single beep often means everything is in order, while a series of different beeps can signal various issues, such as memory failure or problems with the video card. To decode these beeps, users can consult the manual that came with their motherboard or visit the manufacturer’s website. This helps in pinpointing the specific hardware problem the computer is trying to indicate.