|There'd usually be some beeps if it was just a ram problem so if the problem started after you played with the ram sticks then likely something else is wrong, or something in addition to a ram problem. Maybe you accidently did some damage while you were inside the case.|
If you get any kind of normal posting screen then try safe mode as Derek suggests.
If you just get the monitor message about power save mode and the problem started prior to your cleaning the ram sticks then it's usually the motherboard, power supply or both. Check my # 3 here:
Not all the suggestions there may apply to your situation.