Laptop does not start anymore, blackscreen?

Or
2

With my laptop (toshiba)

the boot process did not work properly. So I tried to upgrade my laptop from Windows 8.1 to 10 with a usb stick. Now it does not start anymore, instead the power but flashes 5x. Does anyone have any idea?

Ca

Press Del ESC or F1

Za

For me, the only explanation is that the memory is defective.

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