Hi Geoffey,
Welcome to Sony Community!
The PCG71C11L is the chassis number of the laptop, please verify the model name by checking on the lower right side of the bezel of the screen (VPCxxxx). Please give us additional information about the issue. When you turn it on, what do you see? Do you still see the VAIO logo but not full screen? What is the current operating system of your laptop?
Try some basic troubleshooting on the laptop by doing a power reset and then reset the BIOS to default setting. Please observe if the issue persist in BIOS page.
Regards,
Jen
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