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Yosemite installed on ssd boots only with plugged in usb stick

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When I have unplugged the USB stick and booting from HDD on the screen is in the left upper corner
an white blinking under line.The screen is lighting 4 -5 times fullscreen dark grey/dark (in 1-2 seconds 1 times).Then after that blinking the PC ever enters into the Bios.
Pressed reset or choose the boot drive with boot menu no result.Always blinking then the Bios.
 
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