I bought two new modules of memory today (Transcend 2x4GB DDR3 1333MHz U-DIMM). After installation (I made sure it was tightly installed and the locks 'clicked'), continuous short beeps came. I searched for the beep codes of my motherboard and it says that the memory couldn't be 'contacted.' I uninstalled the module from the second slot and tried to boot, and it works, so the modules should be compatible. I don't know why having two modules of memory doesn't work at all.
[ SYSTEM SPECS ]
CPU: Intel Core i3-2120 @ 3.30 GHz
Motherboard: Gigabyte GA-H61M-DS2
Hard Disk Drive: Hitachi HDS721050DLE630 ATA 500GB 7200rpm
Graphics: Intel HD Graphics 2000
[ SYSTEM SPECS ]
CPU: Intel Core i3-2120 @ 3.30 GHz
Motherboard: Gigabyte GA-H61M-DS2
Hard Disk Drive: Hitachi HDS721050DLE630 ATA 500GB 7200rpm
Graphics: Intel HD Graphics 2000