Member Avatar for MadMontie1

I've got an older Dell Dimension 4550 (likely almost 10 years old)

Without any advance warnings, computer has died.
Pressing the power button results in computer starting for about 3 seconds, shutting down, then restarting on it own and continually running, no additional signs of startup.

Nothing ever appears on the monitor. The "no signal" message does dissapear when plugged into the video card, but remains blank.

Have already ruled out the power supply (purchased new, same thing) and monitor (hooked it up to another computer.

Removed and re-seated video card and all ram sticks. Leads me to believe its the video card, but when I remove the card all together, the same exact boot scenario occurs.

Removed the hard drive and all unnecessary peripherals, same thing.

So, any bets on video card vs motherboard? If motherboard was bad, would anything happen when I pushed the power button?

Thanks in advance folks.

-Montie

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  • Latest Post Latest Post by cguan_77

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Both and have suggested the usual culprits for this type of intermittent boot behavior. Below is a short, prioritized diagnostic checklist and what each result means — ordered to save time and money.

  • Fit a system speaker and watch/listen for POST beeps. Beep patterns (or presence/absence of beeps) narrow the fault to memory, CPU, video, or motherboard.
  • Bench the motherboard: remove it from the case and place it on cardboard. Connect only PSU, CPU+cooler, one known-good DIMM (in the correct slot), and the speaker. Try powering up. If it posts outside the case, the cause is often a short (bad standoff/screw, loose header) or grounding problem.
  • Do a careful visual inspection for failed capacitors (bulging tops, brown residue) and burned components around CPU and VRMs. Take pictures — visible damage usually means board replacement.
  • Check front-panel connectors: a faulty power switch or a shorted front-panel/USB/audio header can cause cycling. Momentarily short the two power pins on the header with a screwdriver (with PSU connected) to rule out the switch.
  • Clear CMOS properly: use the motherboard jumper procedure (or remove battery for several minutes) and verify battery voltage with a multimeter. This is cheap and non-invasive.
  • If benching still fails, test with a known-good PSU and one DIMM. If nothing changes and there are no POST beeps, the motherboard or CPU is the likely failure. Reseating the CPU and checking socket pins is an option but is more invasive.

If the board is confirmed bad, weigh replacement cost vs. buying a used/modern system. Take ESD precautions during all steps and document connectors before unplugging. Mentioning these targeted checks helps avoid unnecessary part purchases and narrows the fault quickly for .

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Member Avatar for mechbas

If possible you can try the graphics adapter (video card) in another machine but that will probably not make any difference either. Seems your system board has permanently gone bye-bye.
"would anything happen when I pushed the power button?" (short answer, under the circumstances) No.

Member Avatar for cguan_77

bump to same problem before, but solution i did was quite simple. you might not believe, but just try changing your CMOS batt, check if you had the luck.

Good luck!

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