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Sabertooth z77 won't boot

Last response: in Graphics & Displays
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August 24, 2012 7:18:16 PM

Ok well this is my first build and during testing everything went smooth, it was working fine for about 2 weeks but now it won't boot. it shows a VGA red led beside it so i'm assuming maybe the graphics card failed? but if i remove the power cable from the back and wait for about 2-3 minutes and plug it back in majority of the time it'll work. Is the PSU insufficent? also when it doesn't boot the vga graphics card is still running but never on max speed.

Case:Rosewill THOR V2
Mobo: ASUS SABERTOOTH Z77 LGA 1155
CPU: i5-2500K Sandy Bridge 3.3GHz
GPU: SAPPHIRE Radeon HD 6850 1GB 256-bit
RAM: G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666)
PSU:CORSAIR Professional Series CMPSU-650HX 650W ATX12V v2.2 / EPS12V 2.91 SLI Ready 80 PLUS
HDD:Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5"
Cooler:COOLER MASTER Hyper 212 Plus

More about : sabertooth z77 boot

a b U Graphics card
August 24, 2012 7:39:06 PM

hazzardous said:
Ok well this is my first build and during testing everything went smooth, it was working fine for about 2 weeks but now it won't boot. it shows a VGA red led beside it so i'm assuming maybe the graphics card failed? but if i remove the power cable from the back and wait for about 2-3 minutes and plug it back in majority of the time it'll work. Is the PSU insufficent? also when it doesn't boot the vga graphics card is still running but never on max speed.

Case:Rosewill THOR V2
Mobo: ASUS SABERTOOTH Z77 LGA 1155
CPU: i5-2500K Sandy Bridge 3.3GHz
GPU: SAPPHIRE Radeon HD 6850 1GB 256-bit
RAM: G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666)
PSU:CORSAIR Professional Series CMPSU-650HX 650W ATX12V v2.2 / EPS12V 2.91 SLI Ready 80 PLUS
HDD:Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5"
Cooler:COOLER MASTER Hyper 212 Plus


If it was working fine before, but not now, it seems like a early failure symptom of some hardware. I'd hazard to guess between the Mobo, GPU and Motherboard, you'd best do isolation testings with another GPU (if you have one), or another PSU (if you have one), etc... And track down what is causing the intermittent boot.

While you are at it, check the PSU cables to make sure they are firmly inserted into the GPU (for the 6 pin header), and make sure the GPU is seated firmly in the PCI-E slot. If you are using a modular PSU, also check that the connections at the PSU are firm too.
a c 290 U Graphics card
August 24, 2012 7:40:30 PM

PSU is definitely sufficient. Why don't you try taking out the GPU and trying to run off onboard?
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August 24, 2012 9:27:04 PM

I checked the wires i know they are firmly in place because the graphics card fan is still working
a c 290 U Graphics card
August 24, 2012 9:36:36 PM

Did you try booting from onboard?
August 24, 2012 10:40:56 PM

How do i do that?
a c 290 U Graphics card
August 25, 2012 12:07:21 AM

Take the graphics card out, and plug the monitor to your motherboard.
August 25, 2012 9:37:18 AM

there is no plug for the monitor on my motherboard... only hdmi would that work?
a c 290 U Graphics card
August 25, 2012 10:52:20 AM

Yes it would. Your motherboard has two video outputs: Display port and HDMI. Choose whichever cable you have.
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