Dell 4550 dead - need help

By themit373 ยท 12 replies
Dec 7, 2008
  1. I just replaced the motherboard in a dell dimension 4550, it now however wont boot. No fans will run, nothing is working. There is however a green light that works on the motherboard when it is plugged in. Anything that may have gone wrong, that is common, and would cause such a problem would be appreciated or any suggestion on what is wrong.
    Thank you
  2. bushwhacker

    bushwhacker TechSpot Chancellor Posts: 783

    Hmm, what kind of motherboard are you trying to boot off? What PSU do you have?

    I'm not sure if the Dell PSU is able to run on non-dell motherboard.

    Did you borrow your friend's power supply and try it out?
  3. SNGX1275

    SNGX1275 TS Forces Special Posts: 10,742   +421

    The most simple explanation would be that you didn't put the power switch on the right jumpers.
  4. bushwhacker

    bushwhacker TechSpot Chancellor Posts: 783

    Ha. It never occurred to me that you never checked your motherboard manual for switches on the jumpers.
  5. themit373

    themit373 TS Rookie Topic Starter

    I got a dell dimension 4500/4550 motherboard and haven't switched out any of the core out for different brands, I have tried to run it off the original power supply that came with the computer and its still didn't run
  6. bushwhacker

    bushwhacker TechSpot Chancellor Posts: 783

    First of all, are you aware that board is obsolete?

    Second of all, are you trying to replace the identical board, or it's different board?

    Have you tried to communicate with Dell technies for some solutions?
  7. themit373

    themit373 TS Rookie Topic Starter

    I received the new motherboard from a reliable source off ebay and is identical to the old one removed. I have not tried to communicate with dell yet for I have found that most times I go to the producer for tech help I end up wasting a lot of time and ending with no answers.
  8. bushwhacker

    bushwhacker TechSpot Chancellor Posts: 783

    Hmm. well, how much did you pay for that board anyway, because it could be better if you start over with custom pc instead of Dell?
  9. themit373

    themit373 TS Rookie Topic Starter

    It would be better, however I really should fix this computer because its my brother's and it died while he was at college....
  10. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

  11. Tedster

    Tedster Techspot old timer..... Posts: 6,002   +15

  12. smatda

    smatda TS Rookie

    Same issue here. It started as a locking up issue. The computer would freeze, not respond to anything but an unplug and then would not power back up.

    I've done everything I can think of. The computer will work fine for days on the bench, and I can turn it off and move it 6 inches and it won't do fans, no power, no nothing. The only way I can get it back on is to take out the CMOS battery, unplug the power supply and leave it setting for 3 or 4 days. (Just taking out the battery, unplugging it, pushing the power button for a minute doesn't cut it.) It takes DAYS of being off....And then it *might* fire back up.

    It will act up completely assembled, and stripped down to a HD, mobo, and PS laying on the table. It's not a temp issue, as it will fail to power up after days of being on, or after days of being off. I've tested the front panel button too. The only thing I can figure is a loose connection or something with the CMOS....I'm about ready to junk it and start over.
  13. SNGX1275

    SNGX1275 TS Forces Special Posts: 10,742   +421

    Bad motherboard or PSU.
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