I recently tried to add 4 gb more RAM in my pc, I discovered my other ddr3 slot was broken. And so I took the mobo out of the case and cleaned the slot, when I re installed it and plugged everything back in, it worked for 5 minutes, then crashed. This went on for 30 minutes, until the pc just couldn’t function. I bought a new cpu (core i3 540) and a motherboard (intel dh55tc) when I installed it recently, it started running (only after resetting Bios) but couldn’t get past Bios. When selecting normal mode, it beeped and reset. When trying safe mode, it also beeped and reset. Is there something that I did wrong, that I can fix?