PS3 goes into standby
 

Hi,
Can anyone help/ My son's ps3 slim turns itself off and goes into standby. Sometimes it does this straight away other times after 15minutes. It possibly got damp a few weeks ago when his fish tank leaked. It was on the shelf above so most water dripped straight to the floor but the base was a bit damp.
I've tried drying it, warming it, i've gone into the system menu to reset it but nothing has helped. I think it probably turned itself off before it had re-formatted.
Thanks