Solved no display and three beep

August 29, 2016 at 23:41:46
Specs: Windows XP
smps power connector connect on the motherboard but no power on motherboard and not start cpu but short smps green and black wire cpu and m/b start but no display and three time beep
so i remove all hardware and reassemble it but same issue face

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August 30, 2016 at 00:15:51
The reason the MB does not allow the PSU to start up fully is because the "standby" circuit on your MB detects a hardware problem with one of the MB components and in order to protect it from damage, it shuts down the PSU.

Now that you have forced the PSU to start-up, the MB components (CPU?) could be completely damaged. No smoke yet?

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August 30, 2016 at 06:13:02
✔ Best Answer
I don't know why, but people from India always call a power supply unit (PSU) a SMPS, & always refer to the tower & everything in it as a CPU. A CPU is the processor, aka Central Processing Unit. THIS is a CPU.

Using a jumper wire from green to black should ONLY be used for testing a PSU. You should NEVER force start a PSU when it's connected to a motherboard. And the beep code you're hearing is a warning that there's a problem. The fact that you're even hearing the beeps mean that both the CPU & PSU are working. Unfortunately, you didn't post the make/model of your motherboard to confirm what the beep code means, but usually, 3 short beeps = memory problem; 3 long beeps = keyboard problem.

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