Posted 18 December 2010 - 05:08 PM
Please check if your serial port is soldered to the motherboard or it is connected via a ribbon wire to the motherboard.
If it is via a ribbon wire, you may want to open up the computer locate the serial port ribbon wire and trace it back to the motherboard.
Here at the motherboard, disconnect the plug from the motherboard, blowing into the plug wouldn't hurt here either. Now re-connect the plug and see if the problem has been resolved.
Here I will explain to you why I suggested this to you.
Over time, metal to metal connections suffer from oxidation, a white corrosive powder which is the by-product of the chemical oxidation process, of air O and water H2O cause a chemical break-down of metal alloys.
Eventually, the electrical connection between the metals suffers from what is called "resistance"
Resistance is the amount of current flow that is being stopped or slowed.
A perfect example to explain this is using a water faucet with a valve as an example, the more flow, the lesser the resistance, the lesser the flow, the more resistance.
Oxidation build-up causes resistance in electrical circuits, if enough resistance is applied, the circuit fails to work at all.
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