unidentified cable/lead

Clarifications

Take off the cable from the motherboard and see if your computer boots up. Have a look at the cable, it will have some markings on it, so that you can take it along to your computer shop so they can identify it.

Please post back if you have any more problems or questions.
If this information is useful, please mark as helpful. Thanks.

hi
looks like a lead to the usb header, got a usb symbol on it.
try disconnecting it, unless its got a power lead to the power switch it should boot without it
try Dell if its proprietary
cheers!

at yer own risk of course... u may be able to "jump" start the machine for use while u hunt a new cable. if your machine has a standard type 20 or 24 pin atx power connector on the mainboard breifly shorting the green wire located jus below the the locking clip to one of the black wires beside it will cause the power supply to start. check this for a visual aid:
http://wiki.xtronics.com/index.php/ATX_Pinout
that is a pic of a 20 pin, on a 24 pin the green wire will be 2 pins further right.

as a precaution i would remove the ribbon cable before attempting to jump start as it may have a short in it that could damage the system if power is applied to it

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systems and this looks like another one. Try Dell Support ans see if they have any spare parts. You'll probably have to find an authorised Dell tech store though.

and in the left hand pane click on Inside the Computer and then select Cables.

http://support.dell.com/support/edocs/systems/opgx240/en/sm/pdf/servman.pdf