I wonder if this is just another case of the old battery.
I have a 2007 macbook pro specs below, It has a start up issue whereas it wont boot unless I leave it plugged in for a few hours but not on, it will then boot correctly and work fine, If I then try to restart it it go through the process then just the CD whirring noise, no apple 'Boing' noise and nothing?, again then if I hold the power button and completely shut off and leave for a few hours it will boot and work fine??
Tried resetting Memory, PRAM, SMC, used different batteries and chargers still the same thing?
Model Name: MacBook Pro
Model Identifier: MacBookPro3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.2 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache: 4 MB
Memory: 4 GB
Bus Speed: 800 MHz
Boot ROM Version: MBP31.0070.B07
SMC Version (system): 1.16f11
Serial Number (system): W87511YJX91
Hardware UUID: 00000000-0000-1000-8000-001EC2075543
Sudden Motion Sensor: