I have tried to upgrade my standard ddr3 2gb to a ddr3 4 gb pny pc3-10666 after I do so I get a power button light up for a few seconds then nothing after I put my default ddr3 2gb back in and boot up I get rtc battery low then it starts up like normal wat does this mean? and is that why I cannot use my ddr3 4gb? also is it a pricy fix? thankyou