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From your question it is understood that the speakers you were using was fully charged and it was working best for 1 hour completely and suddenly it has been stopped and seems to be totally dead. To help you, it is recommended to take the speaker charger and charge the speaker once again and after sometime check if the speaker turns ON working.
If issue persists, it is recommended to replace the speaker if it is in warranty or ask for repairing the speaker. http://support.logitech.com/en_us/home
Plug
your iPhone into your computer or wall adapter to charge. If it does
not charge when connected to either of these, you probably have a dead
battery. The battery will need to be replaced with a new one.
Bad display
It
is possible that it appears nothing is happening because the display is
bad. If the iPhone sounds like it is working properly but nothing is
visible, it is possible the display is bad and must be replaced.
Unfortunately, the LCD and glass panel are fused together, and must be
replaced as one unit.
Bad logic board
If nothing else works, your logic board is probably bad and needs to be replaced. God bless you
Sounds' like your battery is defective. Bring it to the apple store. If they want to charge you for a replacement phone, try to replace the battery yourself, part is on ebay and there is a guide that shows you how at : iPhone 3GS Repair Guide
A lot of these phones get stuck. Reset by using the home and on off buttons. Hold home and on off for 30 seconds then let go of home while connected to computer. Leave connected to computer and restart computer. Leave connected to computer for awhile. Mine came back after about six hours. I think it has something with the RAM and the motherboard powering down. If that doesn't work try putting phone in restore mode and restore.
Disconnect the speakers and see what happens. Carefully examine the speaker cables for unwanted connections (shorts).
Take a clue from when the power problem appeared. Something was moved and made the buzz a (probable) dead short.
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