IPhone 3G Won't Turn On After OS 4.0 Update

A little background about my iPhone 3G to help you guys out -- the sleep/wake button hasn't worked in a few months, so if, say, Safari freezes, I let the battery die out to restart my phone. A major pain, I know.
Tonight I decided to update through iTunes to the OS 4.0. It seemed as if everything was going well, but after about an hour of backing up and installing, my phone is now permanently turned off seeming to have never restarted from the update. To make matters worse, it is no longer recognized by iTunes or my PC. As stated, the sleep/wake button doesn't work so a hard reset or restore is physically impossible. Does anyone have suggestions on how to restore the phone back to the previous OS?
I'm currently trying to reinstall iTunes as I type this.

After several hours of various numerical error messages, freezing loop, iTunes not recognizing the 3G, rebooting the computer (iMac), hard resets, etc, I forced it off and went to bed. Today I found that while iTunes still would not recognize the phone as it would normally, it did when I unplugged and then plugged in the phone. The phone was then restored ( 4.0 was obviously installed last night and then went into a loop). I refused backup, restored OS, but did not continue to restore from back up. The phone is now operational and synced via mobile me, however no apps than system. Based on the latter I will not allow iTunes to restore my backup until this problem is resolved. Some of the said apps are used for business, but I have the iPad to sync them with in the interi.

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Hello amonar,
Thank you for using Apple Support Communities.
For more information, take a look at:
iOS: Not responding or does not turn on
http://support.apple.com/kb/ts3281
If the device remains unresponsive or does not turn on (or power on), reset your device.
If there is no video or if the screen remains black, verify that the device has enough charge to turn on:
If you are using an iPad, ensure that it's connected to the USB Power Adapter supplied with the device.
Let it charge for at least twenty minutes, then see if it starts normally.
If there is no image on the screen, press the Sleep/Wake button to attempt to wake the device.
If the screen displays a red battery icon, continue charging the device until the battery is fully charged. Learn more about charging iPhone and iPod touch, or iPad.
If the above steps do not resolve the issue, or the if the screen remains black or shows a persistent Apple logo, try restoring with iTunes:
Connect the device to your computer and open iTunes.
If the device appears in iTunes, select and click Restore on the Summary pane. Learn more aboutrestoring iOS software.
If the device doesn't appear in iTunes, try to force the device into recovery mode, and then restore it.
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Here is an article for you that will help you troubleshoot this issue:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/ts2802
Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIsand corrosion.
Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
After at least 30 minutes, if:
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The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
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If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
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Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
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