A few months ago, it started to not boot unless I removed my USB headphones connected to a USB hub, everything else worked fine.
Maybe this would cure the booting problem...
I'm assuming you don't want to boot from a USB device normally, so the easiest way to solve this is probably just to disable your system's USB boot capability in your BIOS. It may be listed as "Boot from USB" or "Boot from external device" depending on your motherboard ... but whichever it is, if it's set to "enable", try disabling it and see if that solves the problem. You may also want to check your boot device priority in the BIOS -- make sure Hard Drive is set to first, CD/DVD to second, and anything else either third or not at all.