Hi chaps and thanks for any help you can give me.

I bought a new mouse. A Corsair M65 pro.
I downloaded and installed the Corsair iCue software.
I plugged the usb lead in and the cursor was too reactive to any movement. Literally flying around the screen for a few seconds.
Next thing the whole screen pixellated and crashed and now the PC won't boot.
I get 3 orange flashes, pause, 2 orange flashes from the power button light on the Dell Optiplex 9010 USFF.
The manual says that is possible usb failure.

I disconnected every usb device but the light stays flashing, even with my old mouse.
The graphics card is onboard, part of the motherboard.
Any help, please.

- - - Updated - - -

Turned out to be a faulty stick of Ram.
Corsair Vengeance 1600MHz DDR3 8GB.
I'll have to buy another stick.
So much for Dell diagnostics, eh?