Member Avatar for Wanda_1

Hello, I have a Abit-AN-M2HD mother board, with a Athlon 64x2 processor, I have the exact same motherboard up and running that I am using now.. I installed cpu fan, power supply is working fine, have reset cmos through pin and battery, have back fan and front fan both running fine, used both radon pciex card and nvidia getting no post and no signal to monitor, have tried onboard still no monitor, all fans, hard drive, DVD drives, lights come on work, fan on video cards turns everything seems to work except for no signal to monitor.. I am at a loss now as to what could be wrong. rechecked all connections, inserted ram in different slots, still no post or monitor signal, I know psu works because I took it out of my working computer 2 days ago when I upgraded my main. its a 550 psu.. I upgraded my main to a 750. Any suggestions would be greatly appreciated.. thanks..

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Dani AI

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Building on points from and , the fastest way to narrow a "no POST / no video" system is a short, prioritized bench procedure plus a couple of checks that are easy to miss. The goal is to reduce variables so the fault is clearly one of: PSU, motherboard, CPU, memory, or video output.

  1. Minimal bench boot (order matters): remove the board from the case and put it on a non‑conductive surface. Connect only the 24‑pin ATX, the CPU 4‑pin/8‑pin, the CPU with cooler, a single known‑good RAM stick in the primary slot, and a speaker on the front‑panel header. If the board has onboard video try that first; otherwise fit a single known‑good GPU.
  2. Confirm the CPU power connector is actually seated. Many systems spin fans but will not POST if the ATX12V/CPU connector is loose or absent.
  3. Listen for beeps. With RAM removed a working board usually emits memory‑error beeps. No beeps with a speaker attached points to motherboard/CPU/PSU.
  4. Inspect for physical faults: bulging or leaking capacitors, scorch marks, or debris in the socket. Check the CPU/socket pins carefully — bent pins on PGA AMD CPUs are subtle but fatal.
  5. Swap the PSU or load‑test the rails. A PSU can power fans yet fail under CPU load; a quick multimeter check or a cheap PSU tester is worth it.
  6. Verify monitor/cable/input type with a different monitor and cable and try both onboard and discrete outputs when possible.
  7. If the minimal bench still gives no POST and no beeps, a POST/code card or swapping the CPU/board into a known‑good system is the practical next step; at that point the motherboard or CPU is the most likely failure.

Cautions: use antistatic precautions, avoid forcing or bending pins, and don’t overtighten the cooler. Following the above in sequence usually isolates the fault in an hour and prevents chasing unrelated components.

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Member Avatar for LNSmi

Good-day Wanda,
First point. Without wishing to offend - your use of English is imprecise. Troubleshooting a non-working PC demands precision in observation AND in the ability to describe the symptoms of the failure.
Take a few moments to read your post before you press "send".
I assume the problem is a non-working CPU, but you don't say that directly.

When you say, "power supply is working fine" - did you measure the voltage on various rails, or did you simply assume this because you "took it out of my working computer 2 days ago"?

However, on the balance of probability your PSU may (MAY) be OK!

The failure of your machine to report a POST suggests that the problem lies with the CPU.

Les
The most common cause of failure

Member Avatar for PcTestCard.com

I agreed to the above poster comment.

Here are some of my personal suggestions:
1. have we tried the other monitor and the other working video cable since no video display sometimes could have caused by the faulty monitor video cable.
2. take the RAM all off the mobo, power on and hear if there is any beep sounds. If no, we may doubt the mobo.
3. CPU worth to check, we may try reseat the CPU carefully.

Hope these help,
Bill

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