Don't believe the logic board issue etc until you have tried everything. Shine a flashlight through the logo on the back when it is powered on to see if you see anything on screen. If you do then it is the sleep sensor which can sometimes be fixed by shining the light slowly at every possible angle through the logo on the back. I had this issue on 2011 macbook pro and spent about 1 hour trying PRAM reset and HDD swaps and no luck. Then thought to shine a light through to see if the screen was even working and it was so I was trying to look further to other areas and it must have hit the sensor and bam it came back and no issues since. This is by far the oddest repair suggestion, but worked for me so you cannot rule it out.
If you have not tried PRAM reset holding down [command] + [option] + P + R Make sure it is powered on and use a flashlight and shine it through the logo on the back. Press the keys for launchpad or dashboard so you know something would be on the screen. When you shine the light through the logo if you can see anything, desktop, launchpad or whichever you attempt to open then it is an issue with the sleep sensor. Sometimes this is a silly fix but just slowly try and shine the light at all angles through the logo, I had this happen to me and the flashlight trick got it to come out of sleep mode. Otherwise let us know how it went.
http://www.parts4ipods.com/iPod-Touch-3rd-Gen-Replacement-Speaker Here you can buy the replacement speakers. The location of your speaker is on the backside at the bottom by the dock/ headphone jack. Hope this helps.
http://support.apple.com/kb/ht1533 There's a link to start-up combo keys. You could always try TechTool Pro or Disc Warrior. I am currently resolving an issue which is quite similar and so far it is looking good. iMac G5 runs so slow when boot from disc. But when the install is done I will find out it the format and install works. I will know in about 2-3 hours.
Sounds like the problem I am currently rectifying. I have an iMac G5 1.8Ghz model and same thing boots to the logo and spinning spinning and shutdown. I managed to get it booted into disc warrior and started a repair and it locked up. So I decided to use Techtool Pro and successfully did the repair. I repaired 3 times back to back to ensure it was good. After the repair I lost the visual of my HD on boot and got the little man wondering what to boot to. So Now I have booted into my installation disc and and currently formatting and will proceed to reinstall. If all goes well it should get through. If not I will have to go buy a new hard drive and swap. If that fails, by by logic board. I suggest you keep in the back of your mind that if it is not bad sectors and repair doesn't work. Check out a new hard drive, keep in mind what type you need. If that fails then hit up a logic board. Google does wonders. I figure buying new hard drive and if necessary logic board it is still cheaper than an apple retailer...