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Lenovo thinkpad t450s turns on but wont boot up

The computer power button turns green when I turn it on and it displays the ThinkPad logo and the words 'To interrupt normal start up, press enter'. The screen then goes black. I am able to enter Bios on bootup so it is not a display issue.

I was using my computer yesterday morning, then it died, and now this is happening.

When I plug a power cord in, the green power button flashes 3 times.

I have tried:
- holding down the power button for 30 seconds
- hooking my laptop up to another display
- using a paperclip to reset the battery

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