I have an older computer, probably running Windows XP. It powers on but never reaches POST, and it produces one long beep followed by three short beeps. I've seen suggestions that this could indicate a memory or graphics-card problem, but I'm not sure which component to check first. What does this beep pattern usually mean, and how should I troubleshoot it?
3 Answers
That pattern often points to a memory or video-card issue, but it can mean different things on different systems. Remove and reinstall the RAM, try one memory stick at a time, and reseat the graphics card if the machine has one. Also check that the card’s power cable is connected.
Start by identifying the motherboard or computer model and look up its POST beep codes. A dead CMOS battery usually causes lost settings or an incorrect clock, but it normally isn’t the first thing I’d suspect for this particular no-display beep pattern. Replace it only after checking the RAM and graphics hardware.
Beep codes aren’t universal, so the meaning depends on the BIOS or motherboard manufacturer. Find the PC’s model number, or open the case and look for the motherboard model, then check the manufacturer’s beep-code documentation. In the meantime, power it off and reseat the RAM and graphics card.
The exact pattern varies by BIOS manufacturer, so it’s best not to rely on a generic beep-code chart. The motherboard model will give you the most reliable answer.