D100 PROBLEM Camera will not turn on .....battery is charged but no luck.

For a camera to sit for this length of time will require cleaning the battery contacts within the camera. Check to make sure the battery terminals are not corroded or the battery is leaking in any way The terminals in the camera may be cleaned using a good soft red rubber eraser on the end of a pencil. You can use a puffer to remove any rubber dust make sure these are shinny if corrosion is evident then a more aggressive approach needs to be made. if you don't feel comfortable doing this service/repair I would suggest taking the camera to a repair depot. however if you have a few items around home like the pencil you may be able to affix a small piece of sand paper to the pencil and clean the terminals gently. All this is only if the terminals are corroded (not shinny).

Going back to the battery, check make sure the battery is not leaking and after sitting for that long I'd suggest putting it back on the charger again and let is sit for about 20 minutes then take it out of the charger for 10 minutes and back in again this should give it the kick it needs to start the charge cycle.

I think what has happened the first time you charged the battery the charger couldn't "see" anything (absolute no power) and just went into standby mode. If the battery fails to take the charge you will have to purchase another battery. Once you have power the camera should work as it did before.

Err is usually a camera malfunctrion. Re,ove the batery,a aaaaaatuen camera switch off/on 2-3 times *as if battery still in), replace battery and try again. Read Owners manual or got to Nikonusa.com to download a manual (or to ask Nikon) and determine if your D100 has a hardware reset switch(my dc70 does) and utilize that. If tht does not solve the issue, then service by an authorized Nikon tech is advised.

Having received no response in over a month, I assume this is no longer a problem.

The reason the mirror is acting up is because the Shutter is going bad under slow shutter speeds. > The motor which drives the shutter charge and the mirror up and down is the same .

I had the same problem and thought I had looked closely at the pins in CF slot but after finally taking it to a repair shop, the tech showed me a bent pin. It really wasn't that apparent first time around. He told me its a common problem as long as they use the CF cards. I had the pins replaced and my D100 is working great. Best of luck.

take out the battery and put them back in again then turn the camera back on. This should work it worked for me.

This is normal. Page 17 of the D100 manual says when the main battery is inserted the display will show the number of exposures remaining. If no CF card is inserted it will show E.

Have you tried to reset the camera? I seen this a few times .. and the camera reset did the trick. I've never heard of the motor noise though.

yes i know about this problem. basically its your sensor reading chip which has burnt out. it can be replaced at a cost of about £40/ so not expensive.
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Mine too. It's a worn-out selector switch. Jiggle it and it'll work again. Time delay same. Our college has four Nikon D100s with this problem. Poor switch contacts.