I just bought a used d300 and it won't power up. It has a fully charged battery, and won't even display the shots left when in the off position. The battery voltage is 8.4 on my digital multimeter. It came on briefly and did do what it should, showing flash card (light) and display with menus, but just quit doing anything after about 5 minutes. How dead is it???
Sometimes, checking the battery's voltage discharges it. Try not doing that once and see what happens. Also, it wouldn't hurt to clean the battery contacts in the camera with a cotton swab lightly dampened with rubbing alcohol.
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