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On page 153 of the manual, still on line here: http://cdn-10.nikon-cdn.com/pdf/manuals/coolpix/CP775man.pdf
It says :
So perhaps you could us a card up to 2 Gbyte, but more will be a problem. Even with new firmware it could be the camera can't address more then 2 Gbyte cards.
In the upgrade description (firmware is released in 2002 and the description last edited in 2007) it says you should use an in the manual approved memory card for the upgrade.
So special for the upgrade don't use a huge card. Only after the upgrade try other cards, but be aware the modern cards all could fail to work in this camera
The Nikon Coolpix 775 can be powered using a EN-EL1 rechargeable battery or a disposable 2CR5 type battery (Panasonic, Duracell, Maxell etc). If you are trying to use an EN-EL1 you may want to try using a 2CR5 - this would prove if the battery charger you are using to charge the EN-EL1 battery is working correctly.
You can also try and check if the contacts inside the battery compartment are clean - the camera is quite old and there will normally be some dirt deposits after that length of time.
The auto shut off should be around 30 seconds to allow the built in memory to store everything and rest.If it keeps repeatedly turning off and then on again in a short space of time it will use alot more power from the batteries just Like a car engine uses more petrol stopping at traffic lights. The other factor, I am repeatedly typing on this site is Digital cameras need to run on rechargeable batteries, If you are already using rechargeables,have a look at tha mAh value which should be written on the side. Retailers recomend a value of at least 1800,personally i would go for 2100.