u2713h os x 10.6.8

I have a Dell U2713H high resolution monitor that doesn't come up when starting OS X 10.6.8.

I have to turn it off then back on if its in standby mode from a last shutdown.

Dell doesn't support OSX 10.6.8.

Anyone found a solution? (Previously searched for U2715H... Going back now for U2713H)

I have to stay with 10.6.8 because of software levels like Photoshop CS2 and many others.

Suggestions welcomed.