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New build PC, peripheral devices not recognised before first time boot...!

By Joly9961 ·
Tags: Windows, Hardware
Hi, built a new PC system (i7-10700k, ROG Strix B460 motherboard, 32gb Corsair vengeance DDR4 ram, Zotac RTX 2070, 850W Seasonic Focus PSU. 2 HDDs from a previous system (one of them boot drive with windows installed to be cloned to new SSD), new 1tb SSD and a 6tb HDD.

Everything is connected properly as far as I can tell. On power-on, the CPU cooler, case fans, GPU are all spinning, the power and reset buttons are working. Usb 3 and 2 headers connected to the motherboard, HDDs connected to the motherboard and are spinning.

I can't get the monitor to be recognised. It has power and turns on, but won't work through the HDMI ports on the GPU or the motherboard. My USB mouse and keyboard are also showing no signs of life through either the motherboard IO or the case IO (which is connected, I checked!

UPDATE Ok, something I tried, to add to this;

Mouse is now showing that it has power (red light), but only in the front IO. When I plug the mouse in to the motherboard IO, it flashes once then stops. This gives me a horrible feeling that there's something wrong with the motherboard...still no response from the monitor.

No idea what to do, any help hugely appreciated. Thanks!
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Troubleshooting attempt

by Joly9961 In reply to New build PC, peripheral ...

Ok, something I tried, to add to this;

Mouse is now showing that it has power (red light), but only in the front IO. When I plug the mouse in, it flashes once then stops. This gives me a horrible feeling that there's something wrong with the motherboard...

Thanks!

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Well I would start with the easy things.

by OH Smeg Moderator In reply to New build PC, peripheral ...

First remember to unplug the power lead from the Power Supply.

Unplug everything but the CPU and Power Supply but leave the Header Leads for the Front Panel Buttons connected as they are needed.

Then turn the unit on and listen to what happens. You should hear a series of beeps telling you that the system is incomplete and depending on the M'Board these are different so you'll need the M'Board Manual to tell you what is happening.

When you are sure it is now working turn it off unplug the power lead and fit 1 Memory Module then plug it back in and turn it on. Follow this procedure till it is either working or the Beep Codes tell you what is wrong.

With modern Video Cards they now have connectors for power on them and they do need to be plugged directly into the Power Supply or they may not get enough power to work.

With just the CPU and Power Supply you should be told that the RAM is not working and then when you fit 1 RAM Module it should go on to tell you that something else is not fitted that could be a missing Keyboard, mouse or HDD it all depends on what the BIOS Version of your M'Board is so I can not help you much more than that.

Of course the other thing is just because the lights turn on and the fans spin doesn't mean that the Power Supply is actually working and supplying the correct current on all Power Rails it only means that there is 12 Volts available on that 1 Power Rail and they may even be 12 Volts and 0 current so there is insufficient power to run the M'Board. That generally happens when there is a short circuit between the back of the M'Board and the case where a incorrectly fitted standoff is touching the tracks of the M'Board. It is very important to make sure that all Stand Offs are correctly fitted and under the mounting holes in the M'Board.

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