Question about Dell OptiPlex SX270 PC Desktop

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Computer fails to start

My Dell Optiplex SX270 fails to start when I press the power button. I made sure all cables were secure, which they were. I then saw that the light on the adapter was green so I knew it was getting power, I then saw that on the inside of the computer an orangish, yellowish light was on, so I knew the CPU unit was recieving power, but the unit still failed to start. Please help me

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Re: Computer fails to start

I'm reasonably sure that it is a bulging or bad capacitor issue. We have had Dell replace a large number of motherboards on SX270 and GX270 computers, due to underpowered or counterfeit capacitors on a large batch purchased back in 2005. The capacitors swell or burst until the computer will not turn on anymore. You'll get the amber light inside the unit, plus a green light on the power supply, but the computer will not power up. You can try the solder technique, but you'd be better off replacing the system board, if possible. Happy trails!


Posted on Nov 28, 2007

Re: Computer fails to start

I have seen the same probelm on other dell computers. They have a problem with ther capasitors that dryes out. If you open the computer, it is possible to identify the bad capasitors, the have a round top (normally flat). It is normally 6 to 8 capasitors, that are faulty.
A repairkit can be bought and if you have experience in soldering, then the computer should work after replacing the capasitors. I did it with success

The problem is that the capasitors used aren't specified to be used in this temperature range and thats why they stop working after a while

Posted on Nov 27, 2007

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Re: Computer fails to start

HI Torner,

Does it display anything on your monitor?
(if yes then please continue)

Do you see BIOS load when you start your computer?
(if Yes then answer the next question please)

When booting up do you receive any kind of error message (ie. Hardware Failure, Could not load Operating System).


Posted on Nov 18, 2007

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Won't turn on - power led comes yellow & blinking

Please perform the steps mention:

Disconnect the Power cable / A/c adapter/Battery from computer.
Disconnect External peripherials.
Hold down the power button on the computer for 10 seconds.
Reconnect the power cable or A/c adapter and battery or the computer
Try to turn on the computer
check for Led's on the computer
If still no display ,shut down the computer,disconnect power cable.
Open the computer tower,remove memory modules,reconnect power cable and turn on the computer.If you get a beeping sound after turning on you should be getting beeping sound suggesting the mother board is not bad.Turn on the computer and disconnect power cable from computer.
Reseat 1 memory at a time if you have 2 memory module or if single memory module reseat in different memory slot,swap memory module.
Reconnect the power cable and turn on the computer if it boots to desktop possible issue with 1 of the memory module.
Disconnect the harddrive ide cable from the harddrive .Turn on the computer.
If still unable to power on .Shutdown the computer and disconnect power cable.Remove video card,sound card ,modem card if any .Connect just the vga cable from monitor to the integrated video port.
Connect power cable and turn on the computer.
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the power supply is probably bad. It's really hard to tell without a little more information. When my power supply went bad on my computer. the hdd light would come on but nothing else and the computer would not even try to start.the power supply puts out several different voltages with both positive and negative outputs.

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Remove the memory modules and test them one by one. Or if you can test them in another PC (assuming both PCs use the same kind of modules).

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The monitor has the problem. the message only means, the connector is not properly connected on motherboared . please try another monitor.

I am sure about this...monitor or the connector ( as u have changed the motherboard) of the monitor has the problem.

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How do you remove cover on sx270 optiplex to upgrade memory?

Opening the Computer Cover Dell™ OptiPlex™ GX260 Systems User's Guide
caution.gif CAUTION: Before you begin any of the procedures in this section, follow the steps in "CAUTION: Safety Instructions." caution.gif CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
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notice.gif NOTICE: To disconnect a network cable, first unplug the cable from your computer, and then unplug it from the network wall jack.
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notice.gif NOTICE: Ensure that there is sufficient space to support the open cover—at least 30 cm (1 ft) of desktop space.
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notice.gif NOTICE: Open the cover slowly to ensure that you do not damage any cables. Raise the back of the cover, and pivot it toward the front of the computer

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