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Does the motherboard except 1g memory module ?
If not then it is possible that an IC (intergrated circuit) such as a driver or memory controller chip may have failed when you installed the memory. The memory may of had 5 volts or 12 volts on a contact pin or ground pin which fried the IC that connects to that pin due to the incompatible memory.
If the 1g memory is compatible then you may have installed incorrectly for just a moment thus creating what was stated above.
It is also possible that you have a cold solder joint or desoldered joint on the memory connector. Try applying pressing down on the memory module when the pc starts up.
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