5v Supply from Diecimila

I've been working on a new project with my diecimila board but things don't seem to be going too well. When I checked the 5V supply from the diecimila board it was down to 4.76V.

Is this too low?

I'm powering the board via the USB port of my PC.

It's just on the limit for logic but should be OK. Normally we say + or - 0.25V. However the ATmega chip will work down to about 3.6V at 16MHz.

Thanks for the reply. I'm sure last time I checked (months ago) it was 5V which is why I was concerned.