Member Avatar for Aatif1156

Hi everyone...

I have this computer which turns on but has no display on the monitor...
-CPU fan does not spin
-Does beep when intially powered on
-Have tried 2 different moniters but still nothing

Thanks in adavnce for any help

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  • Latest Post Latest Post by sheikhali449

Dani AI

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Quick, focused diagnostic checklist for — building on ideas from , , , , and . Work methodically and safely: unplug mains before moving parts, use an anti‑static wrist strap if available, and avoid metal tools on powered boards.

  1. Do a minimal bench test: motherboard on an insulated surface, PSU connected, CPU with cooler, one RAM stick (primary slot), and GPU only if needed for video. This removes case shorts and extra peripherals.
  2. Verify the fan/header behavior: plug a known‑good 3‑pin or 4‑pin fan into the CPU_FAN header and into a chassis header. If it spins on a chassis header but not the CPU header, the board’s header or its control logic may be the issue. Note 3‑pin (voltage) vs 4‑pin (PWM) differences when swapping fans.
  3. Reset CMOS (jumper or remove coin cell ~30s) to clear any fan‑control or POST settings that could block boot.
  4. Watch motherboard debug LEDs or POST code display (or attach a small speaker) and try single‑DIMM boots in each slot to eliminate RAM/GPU.
  5. Visually inspect for bent pins (LGA), bulging capacitors, scorch marks or loose socket clips; reseat the cooler and RAM.
  6. If comfortable, measure voltage on the fan header with a multimeter while powered (GND + supply pin) or test with a known‑good PSU/PSU tester. Do not probe blindly — avoid shorts.

If bench results point to a specific LED/code, or the fan spins only on other headers, post the motherboard model and exact POST indicator (beep pattern or code) and the steps already tried for a targeted next step.

Recommended Answers

All 6 Replies

Member Avatar for rubberman

Well, if the CPU fan is not running, then there may be a power supply (or fan) problem. I doubt your issue is the monitor, though possibly the video board (integrated or otherwise) may be fubar. I assume you get no BIOS splash/boot screen?

Member Avatar for Rik_

We could do with some more information like what computer it is.

Member Avatar for tigerbright

Hi , the beeps is the BIOS device designating the first fault via POST testing of the mainboard during booting
http://www.computerhope.com/beep.htm
Just define the long short sequence of beeps and consult the BIOS vendor or service manual BEEP list to define the faulty device or sub-system
If in doubt note your computer vendor and model number and BEEP sequence here, as with that information I am sure someone will be able to ascertain the POST detected fault

ps - ensure the +12v cpu power supply is connected to the socket beside the cpu

Member Avatar for amit.negi

Step for troubleshooting.
1. Check power socket is working.
2. Check power cord is OK.
3. Check SMPS working.

Member Avatar for caperjack

and if the fan hasn't been working for awhile now ,you may have toasted the cpu already

Member Avatar for sheikhali449

Check out the power supply of your Pc it certainly has spoiled

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