Having problems with your Dell OptiPlex GX620 PC Desktop ?

No power and auxiliary power led on in orange

\015 The power cord is connected, but the PC is not starting up and the auxiliary power led on the mother board is ON in orange.\015

Answers :

Could be a bad power supply, bad motherboard, bed device such as a disk drive dragging your system down, or a bad card plugged into the motherboard. Easiest thing is to remove devices such as PCI cards and hard drives one at a time to see if the problem clears. If it doesn't, continue on at your own risk.
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\015\012If your handy with a multimeter, you can make some checks to see if your power supply is good. Read below:
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\015\012You have to determine if the power supply is good or the motherboard or some other device is bad.
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\015\012You will need a voltmeter/multimeter and some experience in reading voltages. If you are unsure, quit now and take it to a professional so you don't shock yourself. Continue on at your own risk.
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\015\012Using your meter set to DC, and computer on and opened, find your molex connector for any drive bay. Google Molex if your unsure what they look like.Then read Yellow to Ground -should be +12VDC. Read Red to Ground -should be +5VDC. If your not sure what ground is, you should NOT be doing this. Continue on at your own risk!
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\015\012If these voltages are good, your PS is PROBABLYgood, and you can hook up the motherboard and hard drive. If your unit powers up fine reconnect every remaining device until the bad device is inserted and the problem returns. If your power supply did not read good then read below:
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\015\012Your power switch on the front of the machine gets connected to the power supply via motherboard. The main power connector at the motherboard passes a momentary "short" signal to the power supply to turn it on. You need to recreate this event with a paperclip.
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\015\012Another way to isolate whether your power supply is bad, you must disconnect the power supply from ALL other devices.
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\015\012Then disconnect the AC input power from the back of the power supply.
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\015\012Then you can use a paperclip to jumper ANY green wire to black wire on the largest plastic connector that you disconnected from the motherboard. Insert the paperclip with everything unplugged and stand back.
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\015\012Once you are clear from the unit. Plug in AC power from wall to back of power supply and see if the fans start up on the power supply. If they start then half of your supply should be good. Re-read your DC voltages at molex to verify other half.
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\015\012Hook up devices one at a time to see if they do their power up routine with motherboard UNHOOKED. You should hear drives spinning and see lights flashing. You do not need to whole computer reassembled for this part to work. If all devices are hooked up and seem ok, then your motherboard is bad.
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The easiest way to check this would be to connect a known good power supply and see if that fires the computer up. If it does, great. If not, then you will be looking more toward a bad motherboard, or cpu.
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