Hi mate, I've been repairing mobile phones for nine years now and have had plenty of N95s including the 8G model come in to our repair centre.
Common cause for faults with the N95 being the main flex cable that connects the main PCB to the rest of the phone, over time the cable deteriorates due to the constant sliding which results in the fine copper traces on the cable shorting out. This can make the phone start to behave very strangely! similar to what you have described. These models are also prone to firmware corruption, so it might be required to re-flash the firmware with and updated version, this could be done through Nokia PC suite, but if the phone will not completely boot up this will need to be done via a special flashing box. Note this will erase all data of the phone. Another common problem is liquid ingress which could also make it behave erratically.
One thing you could try if the phone does not completely boot up is hold down the: * and 3 and green call keys and then press the power switch, keep the *, 3 and call keys pressed until the phone boots up. Also note, this will master reset the phone.
PM me if you want any other info, I am happy to help.
cheers,
Gil.
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