Question Double Boot

Mar 12, 2019
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Hi Guys basically my computer is working fine, recently reinstalled the OS (Windows 10). i have just noticed that when i boot my computer it turns on for maybe 2 seconds then turns off for 2 seconds and then finally boots normally, im almost certain this never used to happen, i have read this can be normal for some motherboards

CPU Intel Core i7 "Kabyake" 7700 3.6GHz (4.2GHz Turbo) Quad Core Processor
Motherboard Z270 Motherboard
Memory 16GB DDR4 2400MHz Dual Channel RAM
Graphics Nvidia GeForce GTX 1080 8GB Graphics Card
Primary Hard Drive 240GB Kingston HyperX Solid State Drive
Power Supply 650W 80 Plus Gold Rated Power Supply

Just thought i would leave my specs here and let you guys let me know if you think this is normal