My computer beeps but does not turn on — what now?

The beeps are the BIOS telling you exactly what failed. Count the long beeps and short beeps separately, look them up by brand in the decoder above, and the pattern will tell you which component is the problem (usually RAM, GPU or motherboard).

Why is my computer beeping continuously?

Continuous beeping (no pattern) usually means a stuck key on the keyboard, a CPU temperature warning, or a power supply problem. Disconnect the keyboard first — if the beeping stops, it is just a stuck key.

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Beep code decoder

If your PC beeps when you press the power button, that is the BIOS telling you precisely what failed. Pick your brand, find your pattern, get the fix.

Brand Pattern (e.g. "3 long 4 short")

HP — 1 long, 2 short HP

What it means: Graphics card / video failure

Fix: Reseat the GPU (desktop) or check external display (laptop). If integrated graphics, the motherboard may be faulty.

HP — 1 long, 3 short HP

What it means: Memory failure

Fix: Reseat RAM. Try one stick at a time in different slots. Replace if the issue follows one stick.

HP — 3 long, 2 short HP

What it means: CPU not functional

Fix: Reseat the CPU (desktop). On a laptop, this usually means motherboard replacement. Check thermal paste and that the CPU socket pins are not bent.

HP — 3 long, 3 short HP

What it means: Memory module error

Fix: Same as 1 long 3 short — reseat each stick of RAM, test individually, replace the bad one.

HP — 3 long, 4 short HP

What it means: Graphics controller / video subsystem failure (most common HP all-in-one and Pavilion code)

Fix: On HP all-in-ones: this is almost always the integrated GPU on the motherboard failing — common on 2018-2020 Pavilion all-in-ones. Try cleaning the heatsink and reapplying thermal paste before assuming the motherboard is dead.

HP — 4 beeps (continuous) HP

What it means: Power failure

Fix: Test with a known-good power supply. On a laptop, try without the battery. If the beeping continues, the motherboard power circuitry is failing.

HP — 5 beeps HP

What it means: General system board failure

Fix: Reseat all components. If beeping persists, motherboard replacement is usually required.

HP — 1 long beep HP

What it means: BIOS ROM checksum error

Fix: Try a CMOS reset (remove the battery for 30 seconds). If the beep continues, the BIOS chip needs reflashing or replacement.

Asus / AMI BIOS — 1 short Asus / AMI BIOS

What it means: Normal POST, system OK

Fix: No action needed. This is a healthy boot.

Asus / AMI BIOS — 1 long, 3 short Asus / AMI BIOS

What it means: Video card error

Fix: Reseat the GPU. Try a different PCIe slot. Test with a known-good card.

Asus / AMI BIOS — 1 long, 2 short Asus / AMI BIOS

What it means: Video memory error

Fix: Reseat or replace the graphics card.

Asus / AMI BIOS — 4 short beeps Asus / AMI BIOS

What it means: System timer failure

Fix: Motherboard fault — usually requires replacement.

Dell — 1-3-2 Dell

What it means: Memory failure

Fix: Reseat RAM, test sticks individually.

Dell — 3-3-4 Dell

What it means: Display failure

Fix: Reseat the screen cable on a laptop, or test an external monitor.

Lenovo / Phoenix BIOS — 1-1-1-3 Lenovo / Phoenix BIOS

What it means: CMOS read/write failure

Fix: Reset CMOS (remove the coin battery for 30 seconds), try again.

Lenovo / Phoenix BIOS — 1-3-1-1 Lenovo / Phoenix BIOS

What it means: DRAM refresh failure

Fix: Reseat RAM, then test sticks individually.

How beep codes work

When you press the power button, the BIOS runs a Power-On Self Test (POST) that checks every critical component in a fixed sequence: CPU, then memory, then graphics, then storage. If something fails, the BIOS uses the motherboard speaker to beep out a code that identifies which component failed and what kind of failure it was.

This was designed in an era when no display was guaranteed to work — your screen could be dead, your video card unplugged, but the beeper was always there. Modern UEFI systems have largely replaced beeps with onboard LEDs and sometimes a small post-code display, but most pre-built desktops still ship with a beeper, and the codes still mean what they always meant.

Listening to a beep code

Patterns are read in order: count the long beeps first, then the short beeps. A long beep is roughly a full second; a short beep is about a third of a second. Some manufacturers use pause patterns instead — Dell, for example, uses "1-3-2" meaning one beep, pause, three beeps, pause, two beeps.

Listen for at least two full repeats before counting — the BIOS often repeats the pattern with a long pause between cycles, and miscounting is the single most common cause of misdiagnosis.

What if your computer does not beep at all?

Two possibilities:

The beeper is missing. Many modern motherboards no longer ship with a built-in speaker — you have to plug a separate "case speaker" into a header on the board. Without one, you get no audible POST codes.
The CPU is not running. Beep codes are produced by code running on the CPU. If the CPU is not getting power, or is dead, you get total silence — and that itself is a diagnostic. Check that 24-pin and 8-pin power connectors are seated, and try a CMOS reset.

Brand-specific notes

HP — Most HP business and consumer machines use the same beep code set. The "3 long, 4 short" pattern is by far the most googled HP beep code; on HP all-in-one units (Pavilion, EliteOne) it specifically means the integrated GPU on the motherboard has failed, often due to thermal stress.

Asus and most modern motherboards use the AMI BIOS beep code set. Asus laptops with stuck "BIOS Utility EZ Mode" do not normally beep — that is a different problem covered in our Asus EZ Mode guide.

Dell uses a numbered system (e.g. "1-3-2") rather than long/short. Each number = that many short beeps with a pause between.

Lenovo ThinkPads largely use Phoenix BIOS codes — very similar to AMI but with some Phoenix-specific patterns documented above.