After working normally and closing the lid, my Sony VAIO PCG-FX701 (PCG-9E7M) will now not startup.
When the power button is pressed the green power light illuminates, followed by the usual pattern of lights.
The DVD drive is powered, as is the HDD, CPU fan & CPU, however, the screen remains blank and there is no power to the USB ports or the PCMCIA slots.
Normally, I have an optical mouse plugged into the USB port and a WLAN card in the PC card slot. On start up both of these light up when the power switch is pressed, but now along with the screen they remain dead.
I have had the machine apart and can see nothing obvious.
Because of the symptoms, I am led to believe that the machine is stuck in sleep mode due to a failed latch detector switch.
This switch is located on the PWS14 board and is also known as the Battery Charging Board or Voltage Regulator Board. Sony p/n A-8049-270-A.
Is my assumption corrrect? I have found a used board on ebay, but before buying it would like some confirmation that this is the cause of the problem.