How to plug usb cables on the motherboard

1) Does it have a separate Ethernet Card, or is it integrated?
(Part of the motherboard)

Reasoning?

The Dell Optiplex GX620 comes with Integrated networking.
The chipset is a Broadcom 572.
It's part of the motherboard, and you plug the Ethernet Cable into the back of the computer.

However, you could have a separate Ethernet Card, plugged into the white PCI expansion slot on the motherboard.

http://www.ebay.com/itm/Dell-Optiplex-GX620-SFF-Motherboard-F8101-KH290-PY423-20-Available-/370743464509?pt=Motherboards&hash=item565208523d

A) If you are using a separate Ethernet Card, replace it.

B) If you are using the Intergrated networking of the motherboard, (Plug Ethernet cable into back of computer), use an Ethernet Card instead.

White PCI slot.

You have a short circuit when you plug the Ethernet Cable into the motherboard. Don't use the motherboard networking, use an Ethernet Card.

2) Plugging an Ethernet Cable into a computer that is on, = No.
It is not a Plug N' Play item.

(Not stating this is what you are doing.
Just posting in case you are. Burns out the Ethernet chipset on the motherboard)

For additional questions please post in a Comment.

Regards,
joecoolvette

I've never seen 2 front USB ports that were bad. I've seen 1 that was defective because the USB device that was plugged into it was broken off. However in that case it caused the power supply to short out and prevent the computer from powering on. Here is a link to your model:
ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-760_Service%20Manual_en-us.pdf
If the USB ports on the back of your computer work then the front ones should too unless there is a connector dislodged to motherboard. All USB ports use the same circuit.

It's a matter of finding a compatible video card for your machine. In all likelihood, your machine will accept a PCI Express video card. Choose what size you'd like, (unless you're a serious gamer who requires a lot of vid memory, a 256MB or 512MB card will do). Then remove and unplug cables from your Desktop and pull out the tower. Remove the cowl and blank so you can add your card to the appropriate slot. Once the card is installed, plug everything back in and turn the machine on. Since it's Plug n Play, your machine will automatically identify the new hardware. At this point, uninstall your previous video hardware in the Hardware Manager and install the new card either by downloading the driver online of if provided, use the disk that should have come with the new card.

See http://support.euro.dell.com/support/edocs/systems/op160l/en/ug/smtabout.htm#1189371 which is the Dell Optiplex 160L User Guide and shows the internal layout of this computer with instructions for removing expansion cards.

this woudl depend on the motherboard but yes most do. look for a silk screen mark on the board marking USB1 or USB2. look at the yellow connectors on this pic for an idea of what to look for

http://www.asusreviews.com/forum/images/assets/fried%20motherboard.jpg

they can be found usually on the bottom front of the board when the board is verticle

1) Unplug the computer from power. Open the computer case.

2) TOUCH the metal frame of the computer case. (Not shouting)
This will relieve your body of Static electricity.

3) Unplug the front panel USB cable from the motherboard. (If there are two cables coming from the front panel, unplug them both)

4) Close the computer case.
Press the Power On button in, and hold it in for a count of Five seconds. Let go of the button.
Do this procedure two more times. (Total of three times)

What you are doing is clearing any CMOS Error Codes, and setting BIOS Setup back to the factory default settings.

5) Plug the computer back into power. WAIT 1 minute. Turn the computer on.
If the computer still doesn't start, the motherboard is fried.
(I believe the computer will work okay)

There is no Service Manual available. If you follow the cable/s from the front panel to the motherboard, you'll see where it/they connect.

HDD Controllers are IDE
http://support.dell.com/support/edocs/systems/op160l/en/ug/specs.htm#1135527

Here is the download page, you need to select model and OS: Driver & Download

There was problem at one time with IOGear KVMs not working correctly with the USB chipset on the Dell motherboards. This problem was resolved by using a USB hub between the KVM cable and the computer. The user could take the USB portion of the KVM cable and plug it into a USB hub and then take the USB hub and plug it into the Dell computer. That should help with the problem.

Hi there is one more thing you should check before buying another mobo. Trace the wires from your on/off switch on the case, unplug it and then bridge the 2 pins out with a screw driver, this will start the computer. runit as normal, then shut down and see if you get a restart. If the computer does not restart on its own you have a faulty switch. Clean it or replace it. Regards mistyman