high input voltage damage

[Altera_Forum]

I'm using altera de0 board cyclone III i put about 4 volts input to one or two of the I/O pins after that my laptop doesn't recognize the altera kit any more when it is connected. 

Did the 4 volts did any damage to the board? How can i make it recognizable?

[Altera_Forum]

Probably CIII is gone..

[Altera_Forum]

Buy another one, they aren't expensive.

[Altera_Forum]

The de0 user manual says 

The DE0 board comes with a preloaded configuration bit stream to demonstrate some features of the board. This bit stream also allows users to see quickly if the board is working properly.  All user LEDs are flashing All 7-segment displays are cycling through the numbers 0 to F My board still does this thing any help?

[Altera_Forum]

It still appears that you have damaged the chip, if you can't communicate with it.

[Altera_Forum]

ok thanks.

[Altera_Forum]

Hi Nada, 

 For your information, the CIII max DC input voltage for pins is 3.95V. You might want to take note of this when you change to new CIII device. You can refer to CIII device datasheet -> Table 1–1. Cyclone III Devices Absolute Maximum Ratings for further details.