Mine was exhibiting similar problems. It was the electrolytic capacitors in the power supply board.
There are 4 or 5 of them, and between 2001-2005 there was a bad batch of capacitors that came out of the far east, some of these capacitors were inferior quality so they dry out and fail. You can read about them on badcaps.net You can usually tell a failed electrolytic because the top cap puffs out slightly. Mine were actually almost pointy on top.
If you have the dexterity, soldering pencil and time, you can fix it yourself for about $5.00. Be warned that as soon as you open the case, you void the warranty, so if you don't feel comfortable, take it to a professional. Also, My remote is dying, so if someone wants to sell me their remote, let me know.
Just had this exact problem and solved by replacing two bad capacitors on the power supply - a $3.50 purchase from Radio Shack instead of replacing the entire (long out of warranty) unit that I use as a terrific sound system for my PC. I actually had the same problem with my Samsung TV - bad capacitors on the power supply. Check out the detailed YouTube videos on the Samsung TV capacitor repair for detailed instructions on how to spot the capacitors, de-solder, replace with new capacitors, and then re-solder the board. I had never soldered before, but it's not that hard, and so far this little trick has saved me at least $700 for a TV and (now) audio system repair/replacement.
If it is still under waranty, take it back to the place you bought it.
If not, have a technician look at it for you.
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will not power on after 4sec stand by comes back on
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