Western digital hard drive doesn't show up anymore

I bought a Macbook Pro a few months ago and I've been using my Western Digital external USB hard drive with up until now with no problems. Then today for some reason, I turn my computer on and the drive doesn't show up anymore. It doesn't show up in disk utility either. I've rebooted a few times but no luck. I inserted a flash drive and it mounts ok so it's not the USB port. I even switched usb cables just in case the cable was bad. Any suggestions?

Hi there
Sorry to hear you are having trouble with your Mac.
Is the ext HD a powered drive (needs AC power to run) or portable? (smaller, doesn't need to be plugged in to AC)
If its AC powered, check that all the usual lights are lit up on it (flashing activity light, power light etc), if not, then you would need to contact WD.
You can also try resetting the SMC & PRAM, as I have seen this cause a HD to not mount before.
Cheers

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