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Ir you are lucky it will be your power supply that's gone dead. Use a volt meter to see if the power supply is working or try to find a power supply with the same characteristics (voltage, polarity and amperage). If that doesn't work, the amplifier may be busted. If so you'll need new speakers.
Should it be a power supply that outputs AC and converts to DC inside the speaker case, or is it a wall adapter the outputs DC straight to the built in amplifier? Some speakers have the voltage and polarity for the plug on the back of the speaker where the power lead plugs in. As they are only small speakers of probably a couple of watts it may only need about 2 Amps or less. Higher current is fine as the amp will only use what it needs to work correctly but I would'nt go below 2 Amps.
Each device is different.
If the receptacle for the plug is not marked, you have few options.
I suggest the following.
Go buy the exact same setup from a store you can easily return it to.
Take the whole box to Radio Shack and explain that you need a power supply to replace the power supply in the box. They will sell you one, plug and all, for about $10-15.
If you have a DVM (Digital Volt Meter), you can check the voltage and polarity yourself, and buy what you need, test it out, and install it.
at most electrical stores you can buy a universal power adaptors with a selection of socents to fit most connections. and which has a selector on it for various voltages settings. take one of the little connectors and see which one fits. then checking the polarity on your device set the polarity the same when plugging the connector into the power supply cable. adjust voltage as needed.
Warning: when connecting a variable power adaptor alway connect on the lowest voltage setting and work up as too high voltage can distroy your appliance.
This is an old type of PC speaker system. Can it be powered by batteries. How many batteries needed?? Multiply the number of batteries by 1.5 volts and you get the voltage rating of your needed adapter. You can also take a look at the back of these GE speakers. Maybe you can find the voltage rating. You may also consider buying a new set of PC speaker that can be plug direct to your power outlet. You can buy it at a cost slightly higher than your needed adapter.
Having some trouble finding any info online about them. Did they have a large power pack that plugged into the wall? If so, there might be some information either right around where they plugged in (im assuming on the sub) or possibly on the product info sticker on the speaker. Make sure if its a round plug in that you look for the tip information (whether if is a positive tip or negative). You might be better off buying a new set, depending on the price of a new adapter, compared to the price of a new set. Let me know if this helps.