Installed a new motherboard and CPU, now I get power, but no signal on monitors and not reaching BIOS.

[anguspie]

Like the title says, I just upgraded my motherboard and CPU, but now when I hit the power switch I get no signal from the monitors. All the fans are going, including CPU fan and graphics card fans, the motherboard's little green power LED is responding, the LEDs on my SSD and HDD are both on, but I don't think the BIOS is booting up. I've tried hitting caps lock to test whether the keyboard is responding and I'm getting nothing. I don't have an internal speaker, so I can't test for post beeps.

To try and fix/discover the cause of this issue I've tried the following:
Removing the graphics card and using the VGA and DVI slot on the integrated graphics.
Using every possible combination of RAM modules and slots.
Clearing the CMOS.
Removing the CMOS battery for 10 minutes.
Checking all the PSU wiring to the fans, CPU and motherboard.
Removing all PCI reliant cards such as NIC and sound cards.
Unplugging SSD, HDD and optical drives.
Checking for bent pins under the CPU.
Checking for wiring or anything trapped under the motherboard.

I honestly don't know what else to do, but I really don't want to have to replace my motherboard or CPU unless I really have to. I'm hoping maybe someone can tell me something I missed.

My specs are:
Intel i5 4690k
Asus Z87-k Motherboard
8GB RAM (2×2GB and 1×4GB)
Nvidia GTX 770 2GB
1TB WD HDD
256GB OCZ AGILITY SSD
800w Corsair PSU

 

[rolli59]

Could be just a bad board.

 

[Suztera]

Possibility that the BIOS version on that motherboard does not support your cpu.
If you only bought an ASUS motherboard that support ASUS USB flashback, you could test that

 

[Calvin7]

By mixing memory kits together, there may be compatibility issues such as unable to boot. I would only connect one hard drive or SSD, whichever one you intend to boot from and install the operating system to.

Case speaker
http://www.newegg.com/Product/Product.aspx?Item=N82E16812201032

 

[Paul NZ]

If this mobo supports USB BIOS flashback. The site doesnt say it does tho

Get the bios update http://www.asus.com/Motherboards/Z87K/HelpDesk_Download/

Extract it, copy the rom to a flash drive, plug it into whatever USB port that supports USB BIOS flashback. Wait for it to finish flashing the BIOS

This mobo needs BIOS 1302 to support that CPU

Core i5-4690K (3.5Ghz, 4C, L3:6M, HD Graphic, 88W, rev.C0) ALL 1302

If it doesnt support USB BIOS flashback, the only thing you can do is take it into a PC shop ask them to flash it with a lower spec CPU.

Then put yours back in. Or you'll have to buy a lower spec CPU then do it

 

[anguspie]

If this mobo supports USB BIOS flashback. The site doesnt say it does tho

Get the bios update http://www.asus.com/Motherboards/Z87K/HelpDesk_Download/

Extract it, copy the rom to a flash drive, plug it into whatever USB port that supports USB BIOS flashback. Wait for it to finish flashing the BIOS

This mobo needs BIOS 1302 to support that CPU

Core i5-4690K (3.5Ghz, 4C, L3:6M, HD Graphic, 88W, rev.C0) ALL 1302

If it doesnt support USB BIOS flashback, the only thing you can do is take it into a PC shop ask them to flash it with a lower spec CPU.

Then put yours back in. Or you'll have to buy a lower spec CPU then do it

It does support flashback, but since I can't see anything on the monitors I'm a little hesitant. I havent flashed a BIOS before. Is it literally a case of just plugging in the USB and turning it on, or will it require my input? Thanks man, I have a feeling this is the way to go.

 

[anguspie]

Wait, ignore me, I was looking at the wrong line on the support chart.

Well, looks like it's time to go salvage hunting for another CPU.

 

[anguspie]

...

Then put yours back in. Or you'll have to buy a lower spec CPU then do it

OK, so I got my hands on a Pentium G3220 and my computer sprang to life. I was able to update the BIOS to the latest build that supports my i5 4690k, then I swapped the pentium out for the i5. Unfortunately it hasn't solved the problem. At least now I know the motherboard is fine, but does that mean my CPU is possibly faulty?

 

[Paul NZ]

Maybe faulty then if it still wont go

 

[anguspie]

Turns out after 6 months of going back and forth that even though they were listed as compatible on the manufacturer's website, the cpu and the mobo were incompatible.