|Since the STOP: C0000218 error disappears when you remove the 512mb module........|
For all of the following, if memory errors caused by the 512mb module being installed are serious enough, that can certainly cause data loss on a hard drive.
- the 512mb module is not compatible with your mboard.
I know from experience that can generate false errors, and weird stall and rebooting problems.
Ram that works in another mboard , or any ram you buy or have lying around, may not work properly, or sometimes, not at all - even if it physically fits and is the right overall type (e.g. SDram, DDR, DDR2, etc.; PCxxxx, xxx mhz) for your mboard. In the worst cases of incompatibilty your mboard WILL NOT BOOT with it installed, and the mboard may not even beep - the ram has to be compatible with the mboard and it's chipset.
See response 5 in this for some info about ram compatibilty, and some places where you can find out what will work in your mboard for sure:
Correction to that:
- or the contacts on the 512mb module have something on them that is causing a poor connection.
You may sometimes get the IRQL_NOT_LESS_OR_EQUAL error from this, or memory dumps.
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
Much less likely:
- or you have a poor connection problem in the slot you put the 512mb module in.
Try the 512mb module in a different slot(s) than you had it in before.
- the 512mb module is bad.
Download a ram test and test the ram.
One complete pass is enough to detect whether the ram is faulty, or faulty only when both modules are installed.
Test each module, then both, and try at least one module that tests okay in all slots to rule out a bad slot.
If you do a ram test, do that AFTER having tried cleaning the contacts and making sure the ram is seated properly - otherwise any errors found may be FALSE.
If the ram is incompatible with the chipset, it will likely FAIL a ram test - that is NOT a true indication of the ram being faulty - there is probably nothing wrong with it, and it will pass the test if installed in a mboard it is compatible with.