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Welcome to my world. Asus Motherboard here, happened to me about 3 days ago. Here's what I've dug up:
1. Front side USB ports. Even if nothing is connected to them, remove the connectors from the motherboard itself. If the problem stops, there's your issue. If it continues, try step 2.
2. Rear USB ports. Same with #1, but you can't disconnect these. I removed ALL USB devices and continued getting that error everytime I started up. If it's the rear ports, then you may have to check your board for grounding problems.
How I solved mine: I didn't. I went into the BIOS and told it to halt on no errors. That allowed it to boot up. My top 2 USB ports in the back are dead. Well, they provide power, but the system will not detect anything connected to them. The bottom 2 work fine, so that allows me to use a mouse and keyboard. Most sources point to a motherboard grounding issue (Which I've had problems with in the past), so the best thing you can do is re-seat your board. Make sure you don't screw in the risers too tightly or it will cause shorts. I used to have to lift my board up a bit off the case to get it to boot properly, so I'm assuming my laziness has caused the same issue you're having right now.
Edit: Just noticed that you said you can't access BIOS setup. So here's a workaround. Purchase a USB to PS/2 adapter. I have about 20 of the damn things laying around. That will let you connect your keyboard via PS/2 and enter BIOS. If that doesn't work, then try completely re-seating the motherboard. Also, be sure to clear your CMOS battery.
Posts
1. Front side USB ports. Even if nothing is connected to them, remove the connectors from the motherboard itself. If the problem stops, there's your issue. If it continues, try step 2.
2. Rear USB ports. Same with #1, but you can't disconnect these. I removed ALL USB devices and continued getting that error everytime I started up. If it's the rear ports, then you may have to check your board for grounding problems.
How I solved mine: I didn't. I went into the BIOS and told it to halt on no errors. That allowed it to boot up. My top 2 USB ports in the back are dead. Well, they provide power, but the system will not detect anything connected to them. The bottom 2 work fine, so that allows me to use a mouse and keyboard. Most sources point to a motherboard grounding issue (Which I've had problems with in the past), so the best thing you can do is re-seat your board. Make sure you don't screw in the risers too tightly or it will cause shorts. I used to have to lift my board up a bit off the case to get it to boot properly, so I'm assuming my laziness has caused the same issue you're having right now.
Edit: Just noticed that you said you can't access BIOS setup. So here's a workaround. Purchase a USB to PS/2 adapter. I have about 20 of the damn things laying around. That will let you connect your keyboard via PS/2 and enter BIOS. If that doesn't work, then try completely re-seating the motherboard. Also, be sure to clear your CMOS battery.
thanks!