I had in two 1GB sticks I bought 2x2GB Corsair Gaming Memory for it and when I put them in together it doesn't turn on. I keep a 1GB in slot 1 and put a 2GB in slot 2 and it boots up fine. I have tried both sticks and they boot up but not together. Does anybody know why it wouldnt boot up? My manual says it supports 4GB of ram.