Startup arrow with circle and y with circle in middle at start up

When I turn on my computer it shows a lightning bolt with a circle around it and a circle with 2 lines on sides resembling a y. I need help. Thanks in advance

It's starting in target disk mode. Normally that happens when you hold down the key combination command-T at startup. Disconnect all external input devices and try again. If it still happens, reset the PRAM/NVRAM. If that doesn't work, it has to be serviced.
Resetting your Mac's PRAM and NVRAM

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