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Computer won't recognize monitor, mouse & keyboard on boot

  • Monitors
  • Motherboards
Last response: in Motherboards
May 4, 2013 12:11:05 AM

I just received a new replacement for an RMAd motherboard but now when I turn on the PC, the monitor immediately goes into power saving mode and switches to an amber/yellow light while the kb&m remain off.

The monitor, kb & mouse work fine on another computer.

Things I tried:

- Resetting the CMOS by removing the battery and putting it back in.
- Unplugging all the wires connected to the PSU, using a can of compressed air to dust off the inside, then reconnecting the wires.
- Using different cables.
- Turning it on w/ only one gpu and one ram stick inside
- Completely reassembling PC
- verifying CPU position and thermal paste
- checking if wires are plugged in right

windows 7 64 bit
asus p8z77-Vdeluxe
16 gb DDR3 ram
intel core i7 3770K
x2 nvidia evga 670 GTX
corsair HX750

More about : computer recognize monitor mouse keyboard boot

Best solution

a c 785 V Motherboard
a c 112 C Monitor
May 4, 2013 12:26:33 AM

Look at the mb ser number label they may have sent you a mb with an old bios. I would pull the gpu and then use if your mb has it the asus USB flash back. Also check that your 4/8 pin atx power plug is in tight. If the mb bios is up to date. See if a friend has a power supply you can use. A lot of times the power good line will drop below atx spec. It cause the CPU not to post but the other stuff like led and fans will work.
a c 270 V Motherboard
a c 172 C Monitor
May 4, 2013 4:28:57 AM

Your motherboard support site:

1) unhook all HDD/SSD's (leave DVD drive)

2) remove BOTH graphics cards and use the onboard DisplayPort or HDMI if possible (if your BIOS is pre-set to iGPU perhaps the video is actually there. Probably not... ).

3) *Your motherboard has both:
a) LED indicators next to key components (see motherboard manual)
b) ERROR CODE LED (manual 2-23)

You should see these CODES changing as tests are run in POST, then show a SINGLE CODE.

4) Is your CPU fan spinning up at all? If so, does it stay spinning?

May 4, 2013 12:05:16 PM

Ok so thanks to smorizio it finally works... I followed the suggestion to update the bios via usb flashback and now the monitor is on and plugged to the onboard hdmi port and the kb&m are being recognized

Thanks again