Problems with new build, blinking underscore on boot only

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Joined
15 Apr 2003
Posts
334
Hi

I have just put together the following pc

4790k cpu
Gigabyte z87-ud7-th
2x8gb hyperx ddr3
480gb corsair mx100 ssd
Dvd writer

When turning it on all I get is a blinking underscore on the top left of the screen. There is no bios post / splash screen. The code on the motherboard reads as A9 - bios is initialised.

After doing some reading I found that perhaps the mobo does not support the cpu and I would need to flash it to the latest firmware. I looked on the Gigabyte website and it said a G1820 CPU is supported from the initial release so I bought one of those only to find it does exactly the same thing.

I have tried with single sticks of memory and nothing.

This is driving me nuts so any help is appreciated.

Thank you
 
Try these,

ClearCMOS.

There is a BIOS switch on that board? flip it to the other BIOS when powered off, then try.

Remove everything apart from CPU/cooler and single RAM stick, connect monitor directly to the board if you are using a GFX card.
 
Try holding down F2 or delete when booting (I've had a board before that bios default disabled the splashscreen and if no bootable media was found it just went to a flashing cursor and did nothing else) and/or using a different display output if you have multiple ones.
 
Have tried the following now:

Clear cmos
Bios switch
Unplug everything except 1 stick of ram
Holding down delete / f2 when booting

Still nothing. Is it most likely the motherboard is at fault?

Thanks
 
Starting to sound like a possible faulty board.

I've not had any results from it myself but some people suggest holding down the power button until the system starts and cuts out itself then depressing it and starting again or holding down both power and reset at the same time for 10 seconds to start it as ways for forcing the backup bios to kick in if present - but I've never found either method to work personally.
 
F4 is when that Pentium is suppose to be supported, but there are two earlier BIOSes, so could be the board needs to be updated?

My advice is to contact Gigabyte CS and send them the board+CPU+RAM and let them sort.
 
Although I don't think that can be it as the G1820 is listed as compatible with the earliest Bios and that exhibits the exact same behaviour, what a waste of £30 that was.
 
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