System unbootable after RAM upgrade Tags: Memory Sdram Last response: February 23, 2008 12:26 PM in Memory Share DG-- February 23, 2008 8:29:49 AM Hi I have an MSI P965 Platinum motherboard, which had 2x1GB 533 DDR2 SDRAM installed I now have another 2x1GB DDR SDRAM, and I think its the same speed, but with all four chips installed, the system doesn't boot I can however boot the PC with either of the pairs of 2GB installed, so it recognises all the chips, but won't boot with all four installed, only when they are in their original pairs Any ideas why this might be? thanks very much for any help DG More about : system unbootable ram upgrade | E-mail me updates | Report abuse Register or log in to remove akhilles February 23, 2008 11:50:23 AM Not enough info. List the make & model of the ram. I think it's the vdimm. | Report abuse mobo57 February 23, 2008 12:17:09 PM You think it's the same speed? Thats probably the problem. You probably have your mobo SPD settings on auto. If the memory modules are different and have different settings, can be a problem, like akhilles said, vdimm for instance. | Report abuse notherdude February 23, 2008 12:26:40 PM ^^ agreed. Tell us the exact brand/model and we can look it up. | Report abuse Register or log in to remove Ask the community Publish Tom's Hardware>Forum>Memory>System unbootable after RAM upgrade> Related ressources: ForumRecovery of a Raw Format WD 320GB segate External Hdd/ Unbootable Win7 ForumUpgrades leave computer unbootable . ForumUnbootable but readable HDD. how to transfer files onto an external? ForumWin7 setup format leaves unformatted HD unbootable ForumUnbootable with Video Card ForumRandom system freezes after ram upgrade ForumBSOD stops when I remove RAM sticks? ForumMissing DLL file, unbootable , need assistance ForumImpossible temps in bios and unbootable windows 7 ForumAfter normal win7 install, cannot boot ForumNeed to use boot HD in mew Mbd after Mbd failure ForumMissing operating system after bios flash and ram upgrade ForumLaptop refuses to boot after RAM upgrade ForumDual Booting SSD + HDD ForumSystem wont boot after ram upgrade ForumCan't boot after upgrade (ICH9->10) with AHCI enabled ForumCPU compatibility. ForumWhats your GA-P35 CPU and "System" temperature at idle? (air cooled) ForumMSI P31 4x1Gb XMS Ram? ForumUpgrade options for Tyan K8W More resources Read discussions in other Memory categories Compatibility DDR2 DDR3 Dual Channel RAM Corsair G.SKILL !