This is effectively a new build. I've installed W7 and got it up to date, and Office and put all the office patches on, downloaded and installed the chipset drivers (Gigabyte FM2 mobo) and it wanted to restart after the last update - can't remember what it was, suspect a large Office update. I've also installed the driver for my Canon printer, and the Netgear Raidiator utilitity since last time it rebooted.
Now it won't boot past the splash screen and it won't respond to the keyboard so I can't get into the BIOS, which is UEFI.
It has two HDDs, the smaller one with C: (windows and software that doesn't offer a choice) and D: (user directories, software I can put somewhere other than C), and a larger one which is E: and only has data on - it did have a boot partition but I removed that and expanded the file system I wanted to keep. I'm sure it's rebooted since then.
I've take out the USB stick that was in and checked there isn't a DVD / CD in and still it doesn't want to boot, having done so many times as I've done all the Windows Updating.
I have no idea where to go from here. Advice, please?
Now it won't boot past the splash screen and it won't respond to the keyboard so I can't get into the BIOS, which is UEFI.

It has two HDDs, the smaller one with C: (windows and software that doesn't offer a choice) and D: (user directories, software I can put somewhere other than C), and a larger one which is E: and only has data on - it did have a boot partition but I removed that and expanded the file system I wanted to keep. I'm sure it's rebooted since then.
I've take out the USB stick that was in and checked there isn't a DVD / CD in and still it doesn't want to boot, having done so many times as I've done all the Windows Updating.
I have no idea where to go from here. Advice, please?