Z370 Extreme4 No signs of life except board LEDs

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   Hi!

I'm assembling a new PC using
AsRock Z370 Extreme4 mainboard (MB),
Corsair 100R case (CS), and
EVGA 750 GQ power supply (PS).
However, the MB does only show slowly blinking and rythm-changing LED lights when plugged in and switched on. No fans are active, nothing happens.
At first, I thought the front-panel pins were not inserted correctly. A test with another MB (also with no cables, RAM, CPU, or any GPU plugged into the MB besides 24pin and 8pin power cables as well as the pins for case LED+-, HDD+-, reset and power switches) showed that fans were spinning and the case LEDs were on.
What could be the problem here?
Why can the/this Z370 Extreme4 not be turned on? 
This puzzles me and I really appreciate your help. Thanks!

Edited by mab - 23 Nov 2017 at 6:19am

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mab Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23 Nov 2017 Status: Offline Points: 3	Post Options Post Reply Quote mab Report Post Thanks(0) Quote Reply Topic: Z370 Extreme4 No signs of life except board LEDs Posted: 23 Nov 2017 at 6:12am
	Hi! I'm assembling a new PC using AsRock Z370 Extreme4 mainboard (MB), Corsair 100R case (CS), and EVGA 750 GQ power supply (PS). However, the MB does only show slowly blinking and rythm-changing LED lights when plugged in and switched on. No fans are active, nothing happens. At first, I thought the front-panel pins were not inserted correctly. A test with another MB (also with no cables, RAM, CPU, or any GPU plugged into the MB besides 24pin and 8pin power cables as well as the pins for case LED+-, HDD+-, reset and power switches) showed that fans were spinning and the case LEDs were on. What could be the problem here? Why can the/this Z370 Extreme4 not be turned on? This puzzles me and I really appreciate your help. Thanks! Edited by mab - 23 Nov 2017 at 6:19am

bembe Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23 Nov 2017 Status: Offline Points: 20	Post Options Post Reply Quote bembe Report Post Thanks(0) Quote Reply Posted: 23 Nov 2017 at 9:13pm
	Double check Power supply cables. Did you plugged every required one? Also check if your processor is correctly positioned. Sometimes pins get bent and that could lead to simptoms you mentioned.