Installed new CPU - no display

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A most decorated potato

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Oct 17, 2015
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Hello,
Relevant specs:
ASUS MAXIMUS VI HERO LGA 1150 Intel Z87
Gigabyte GeForce GTX970
i5-4570
I recently upgraded my i5 to an i7-4790K. Prior to this I updated my BIOS, and even double checked the version in the BIOS screen. BIOS was updated, computer was working fine, thought I was good to go. Put in the i7, struggle with the fan a little bit but otherwise no problems. Boot up my machine, everything lights up, all fans spinning, and no display. Listen with my headphones I don't hear any Mboard beeps. What has me concerned now is I tried to boot it back up with the i5 and have the same problem. I know I didn't install the cpu incorrectly, didn't touch the pins/connectors or anything. Tried plugging it into the TV and have used different HDMI cables, nothing. Had heard a trick of booting the machine with 1 RAM stick, that didn't seem to work either. Not sure what's going on here - did the CPU slot on my Mboard suddenly go bad?
Thanks in advance.
 
Solution
chemmajorp53
When you clear the CMOS, it resets the BIOS to default, which includes setting the default video output to the iGPU, not your discrete GPU. You'll have to fix that later in the BIOS. When you clear the CMOS, it's not setting it back to the old BIOS, it's clearing all user input values from your new BIOS.

So, next steps: Set the primary video output to PCIe1 or whatever slot your gpu is in, then restart until you get display off it takes a few tries sometimes
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A

A most decorated potato

Reputable
Oct 17, 2015
8
0
4,510
So, it seems resetting the CMOS did work after plugging the monitor into the Mboard and not the GPU (had tried this before CMOS reset not after). Safe to assume that I just need to reinstall my graphics card drivers now?

There is one other thing I don't understand as well - if clearing/resetting the CMOS is basically putting the BIOS back to the defaults, why does my Mboard recognize the i7-4790k? It was my understanding that at its default BIOS my Mboard wouldn't recognize the CPU, but it clearly does, both in BIOS and in Windows 10.
 
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chemmajorp53

chemmajorp53

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Apr 5, 2013
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When you clear the CMOS, it resets the BIOS to default, which includes setting the default video output to the iGPU, not your discrete GPU. You'll have to fix that later in the BIOS. When you clear the CMOS, it's not setting it back to the old BIOS, it's clearing all user input values from your new BIOS.

So, next steps: Set the primary video output to PCIe1 or whatever slot your gpu is in, then restart until you get display off it takes a few tries sometimes
 
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Solution
Phillip Corcoran

Phillip Corcoran

Titan
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Sep 7, 2013
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Putting the BIOS back to it's defaults does not revert the BIOS to an earlier version, only it's custom settings are affected (changed back to factory defaults).

If your existing BIOS version supports a specific CPU model, it will still support it after a BIOS reset.

Basically, you misunderstand what a BIOS reset actually does. The version number (of the BIOS) is unaffected.
 
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