I recently bought an 8gb single memory stick but when i installed in on my pc , and tried to turn it on it kept on restarting over and over again . when i checked the bios it showed that i had installed 8gb of ram . but still my windows isn't starting properly . can you please suggest me a way to fix this issue or should i return the 8gb single stick and purchase 2x4gb sticks ? or do i need to update my bios ?