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I have a problem: DZ77GA-70K that I have just installed in my machine does not want to boot

Community Manager

The intel extreme motherboard DZ77GA-70K that I have just installed in my machine (Specs: Mobo: DZ77GA-70K, Cpu: Intel i7 3770K, Gpu: EVGA Geforce GTX 970 SC ACX 2.0 with 4GB Vram, 24GB RAM(2X4+2X8), HDD: 1TB WD blue + 1TB Seagate, PSU: Thermaltake smart 550W) does not want to boot (fans turn on but only thing on display is the intel extreme boards logo) i receive a digital code on the mobo that shows "F5" Anyone know how to fix this problem? Any answers are much apreciated! feel free to ask me any questions regarding further specs of my machine and/or the steps that I have attempted in making this machine work. Thanks again!

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2 Replies
Super User Retired Employee

Remove all but one DIMM and try again. If this works, add others back in until it fails. Make sure that DIMMs put into a single channel are the same. That is, put the two 8GB DIMMs in the same channel).

Hope this helps,


Community Manager

Hi jujuthebos4,



I am following up on your case. Let me know if I can help you with anything else.





Mike C