In situations like these, there's several potential problems:
1. Just reboot.
The computer can sometimes get confused, especially if the BIOS or OS power safe functions are buggy interacting with the specific hardware. It may also requires a "hard" or "cold" boot, meaning you'll want to shutdown (turn power off) of the computer. Then turn it back on.
2. Find correct drivers, and try again.
The drivers that were reinstalled were not correct, thus obfuscating the underlying problem pre-reinstall.
3. The ports have died.
That simply happens sometimes. Computer hardware does age and give out.
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