Question I just bought a new mother board and cpu.after putting it all in the case it wont boot to bios. Dram and cpu led blinking.

Mar 16, 2023
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I tried swapping ram slots ,tried use only 1 ram slot, pull out cmos batery,reset cmos. Nothing.. i have 4 ram stick ,i tried put all one by one.checked all the wires all is good.. then i tried to put my old system back on the case,same thing happen.what do i do now?
 
Mar 16, 2023
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turned out its my mobo (B660m) need bios update to support my cpu (i7 13700f)🫠.my old system didnt post was caused by bad cpu contact to the mobo. It post after i clean some black stuff on cpu contacts.