Boot loop and Unknown USB Device

I recently built myself a new mini-ITX gaming PC. Each component was chosen with care and gently slotted into place; or at least that's how I choose to remember it.

CaseBitFenix Prodigy
PSUBitFenix Fury 650G
MotherboardGigabyte Z97N-Gaming 5 (rev. 1.0)
CPUIntel Core i5 4690K
RAMG.SKILL TridentX 8GB (F3-2400C10D-8GTX)
GPUMSI GeForce GTX 970
OSWindows 7 Home Premium (64-bit), SP1
KeyboardFilco Majestouch
MouseRazer DeathAdder 2013

Behold my creation

Everything about my new compact gaming PC was pleasing, except for one problem. Almost every time I switched it on, it would reboot several times at the BIOS before eventually starting Windows. There were no error messages or beeps during this cycle. It was a mild annoyance at first but grew infuriating as the weeks passed.

Then, one day, it was joined by a second problem. When it would eventually boot to Windows, the message "USB device not recognised" would appear and my mouse wouldn't be working. I had to crawl under my desk and unplug the mouse for a few seconds to get it working.

I consulted the search engines

I tried various suggestions that I found on the Web.

None of these made any difference.

The solution

I disconnected the CMOS battery from the motherboard for a few minutes.

When I switched my PC back on, it booted to Windows the first time and has continued to do so ever since. I no longer get warnings about faulty USB devices.

My DeathAdder is also working perfectly now; both before and after reinstalling Razer Synapse.


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