android device not responding, no indication of anything

My oneplus 1 isn't switching on and isn't detected by windows. If I connect it to windows, I get a message saying 'USB device not recognized'.
Earlier, my phone went into fastboot mode, and I used adb to exit fastboot as volume buttons do not work. Last week this happened again, and this time I removed the sim card, and then used adb to exit fastboot.
Now, my phone is not responding, it is not even indicating the fastboot mode.

Please help. Thank you.

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