So this is a weird issue. This computer seems to function fine, so long as it only has 2gb of memory installed. original stick is a 2gb PC3-12800U-11-11-A1, I can run this stick or any other 2gb DDR3 stick in either of the two slots and it works fine. I can also put two 1gb DDR3 sticks in the machine and it works fine. However if the memory capacity surpasses 2gb it does not get a picture at all, or beep codes.
HP Pavilion S5-1224
HP Pavilion S5-1224