Do you have a pot/trimmer connected to the contract pin of the LCD?

Oh and i exploded a pic earlier, got a new power supply from maplins, read the destructions ,dialed in 5v lcd was blank so turned up the current and the voltage dropped to 3v so adjusted the voltage to get 4.5v, then adj the current a bit , the voltage shot up to 25v and bang.
I have said it before and I will say it again.
Always have safety glasses on while programming