My Computer Makes Ticking Sound Once at Startup and Once at Shutdown

Jul 6, 2018
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Hi guys,
I'm not using any Hard Drive. So, it's not coming from Hard Disk. I checked it's coming from Power Supply. Once when I start my computer and once when I shutdown it.
Is it normal or not?
I'm using a Seasonic 750w SS750HT power supply.
Thanks in advance.
I'm waiting for your responses.