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It's a handy little debug LED. Useful for troubleshooting as it gives error codes if something goes wrong on boot.

Case-NZXT H440 | Motherboard-Gigabyte Z77X-UD3H | RAM-Kingston HyperX Blue 2x8GB 1600MHz | CPU-Intel 3770K @ 4.3GHz at 1.215v | Heatsink-Coolermaster Hyper212 Evo | GPU-EVGA GTX660 SC | SSD-MX200 250GB | HDD-Seagate Barracuda 3TB | PSU-EVGA GS650

Mouse-Logitech G600 | Keyboard-Ducky Shine 3 MX Blue. white backlight | Headphones-Audiotechnica ATH-M50s. Beyerdynamic DT990

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The crosshair 5 formula-z has that, It's a POST readout, if something goes wrong during or after post it will give you an error code which you can diagnose using the manual. 

CPU: Intel Core i7-4790k @ 4.7 1.3v  with a Corsair H80 w/Dual SP120s - Motherboard: MSI Z97 gaming 5 - RAM: 4x4 G.Skill Ripjaws X @ 1600 - GPU: Dual PowerColour R9 290- SSD: Samsung NVME SM951 256GB-- PSU: Corsair RM 1000  - Case: NZXT H440 Black/red - Keyboard: Coolermaster CM storm Quickfire TK, Cherry MX blues - Mouse: Logitech G502 - Heaphones: Beyerdynamic DT 770 - Monitors: 3x VE248H Eyefinity 1080P -  Phone: iPhone 6S Plus               Please post your specifications in your post, signature or even better, system page on your profile!

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