Alright, so it goes like this. I had two high end webcams attached to my computer using the back USB ports. and both my keyboard and mouse were also on USB connections back there. In front I had two PS3 style gamepads, and each of them had a 7 foot extension cord. (We game on a large LCD with dual view.)
Anyways, my keyboard started flickering on and off on day, and by on and off I mean the lights in it did. I use an eclipse keyboard as seen in this spoiler:
Ok so the keyboard flickered on and off a few times, between functioning and not. So I rebooted the machine, and nothing seemed wrong at first but there were some major issues. Upon login, my keyboard failed, and the mouse did as well. Ontop of that, my mediacard reader drives were gone, and all my USB devices were none functional. In fact they were gone from the device manager altogether. I hardbooted the machine and reverted to a serial keyboard and mouse, and the PC is functional again, but the USB ports and media card reader are fried out for lack of a better description.
My first guess is malware of some kind or another. So I backed up everything I had to a shitload of DVDs, and formatted the machine. Upon re-installation of the OS, I see it did not help, the devices are still gone.
Interestingly, the IRQ numbers on the bootup screen are all pretty similar to one another concerning these devices. SOO, I'm thinking it could be a major conflict of some kind, but in the OS nothing shows under the device manager.
I'm thinking the USB devices were under powered via too many extensions and devices attached. Which fried out a section of my mobo, but can't say for sure as there is no descernable effects inside the tower. Any ideas?
Does your keyboard light up during boot (nice keyboard, BTW)?
Too many usb gadgets can cause problems, but for them to fry the motherboard sounds a bit extreme.
You could try enabling legacy usb support in BIOS (that supposedly helps with some types of USB devices), maybe check the manual for other USB-related options, install the latest motherboard drivers for USB ports too.
It may also be a resource allocation problem. My USB mouse only works if I connect it to one of the frontal USB ports, probably because I have too many gadgets connected to the other ports already.
Try seeing if the keyboard and mouse work without all the webcams and PS3 controllers and extraneous junk plugged in. Just the keyboard and the mouse.
The USB ports don't work at all. No keyboard lights, no optical light on the mouse, nothing. After formatting, the computer listed an "unknown serial device" in the device manager, and no USB devices. However, upon updating to service pack 3, the unknown device went away and USB devices now appear in the device manager. They dont work though. Flashdrives, gamepads, digital cameras, hell even my media card reader.
Prior to all of these problems I had two cameras attached, two different digital camera devices, USB mouse and keyboard, and two gamepads. All ports were used.
MrFancypants;4784068 It may also be a resource allocation problem. My USB mouse only works if I connect it to one of the frontal USB ports, probably because I have too many gadgets connected to the other ports already.
I've had the same problem before. I noticed that when I plugged two different (power hungry) devices in, they "fought" over the power (I guess I had a weak Power Supply)
the unknown device went away and USB devices now appear in the device manager. They dont work though. Flashdrives, gamepads, digital cameras, hell even my media card reader.
That's a good sign (sort of). At least we know the drive just didn't disappear (even a fried USB controller on the motherboard would show up in device manager, it just wouldn't work)
Now I did have a problem like that before in the past. It was related to plugging in so many different devices into the same port. Eventually Windows got confused (the registry was a mess).
When you reinstalled windows, did you "Update" windows over windows? Or did you format the whole disk and started from scratch?
Complete format, system has fresh data which pretty much rules out software failure, corruption.
Yeah.... Sure sounds like hardware issues, unfortunately. Do you have any PCI usb ports?
Its also strange that the media card reader failed as well....... Certainly sounds like you've got dead hardware on your hands.