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Dell Desktop (Optiplex 745) couldn't run

I have following problems:

1) When I press power button. It shows indicators blinking.
2) But the cooling fan doesn't runs as well as there is noting displaying in monitor ? What could be the problem.

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  • 814 Answers

This could be a bad power supply. When turned on do you hear any fan noise from the power supply. If not check and see if the power supply looks dirty of has a burnt smell. This could indicate a bad power supply.If the power supply is working, check all the connections to the motherboard for possible loose connections.This would cause a failure of the power good signal to allow the computer to turn itself on.When checking the connections check the motherboard for dust and dirt that may be affecting the operation of the cooling fan. Check the fan itself and check the motherboard for possible bad capacitors. These can be identify by bulging tops or bottoms. Check the main processor for the same dirt and dust problems and check to see if the heatsink is making good contact with the processor to cool it correctly.You may have to remove the heatsink and reapply thermal paste and reseat the heatsink itself to insure proper operation. You must also check the memory of the computer to see if it is seated properly and is functioning.You must use antistatic protection to check this out by ground yourself on some nonpainted metal object to discharge the body static. If you do not do this you could damage the memory and the processor if you must touch and remove them for cleaning. You should use canned air to blow all the dust and dirt off the motherboard and connectors.be sure to never due any cleaning or troubling shooting on your computer with the power connected. You amy also try to isolate a bad component in you set up by disconnecting all items in your system but 1 stick of memory and harddrive. Leaving all other components disconnected to see if the computer will start. Then connect each component back including the memory sticks to see if you get a failure again. the last component you attach before the failure will be the faulty one.If non of the above solutions help you may have had a motherboard failure and may have to replace it. Hope this helps you with your problem. P.S. if this is over your head then take your unit in to a service center and have them check it out for you.

Posted on May 12, 2009

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I have a dell optiplex 745 and the light on the power button flashes orange when power is connected. There is also no notable damage to any capasitors on the motherboard.


Whenyou plug in the power cord is there any lights whatsoever on the laptop, wherethe plug goes in or on the AC Adapter of the power cord?

When you press the power button do you hear fans running, hard drive spinning,lights on the computer, hear any beeps or lights constantly blinking, hear theDvD/CD drive click and the light on the drawer of the DvD/CD turn on for asecond or two? If so the computer is trying to boot or may have booted,but the screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with thelaptop and why it is not booting. Most times it's a motherboard issuewhen you hear beeps or blinking lights continuous. Most times the problemis with the memory or Video Card. Count the Blinking Lights or Beeps and takenote of their pattern (1 Long or 1 Long followed by 2 Short).

Maybe you have a Static ChargeBuildup. Remove the Power Cord, then Press and Hold the power button for30 seconds. After 30 seconds plug the power cord back in and hit thepower button to see if it boots. Maybeyour memory is bad or the memory slot is bad.Removethe Power Cord, Open the Case and remove one of the memory chips. Set thechip aside then try rebooting the computer. If it boots, then you knowthe memory chip you set aside is bad so mark an x on it with an ink pen. If it fails to boot then move the chip to the next memory slot and tryrebooting. If it fails take the chip out and set it aside, then put theother chip in and try booting it in both slots. If it boots, just toverify that the chip set aside is bad, mark an x on it and put it into the openmemory chip slot and try booting.

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I hope this helps, if so please rate my solution.

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