reseat the memory and maybe the processor, if that doesn't work then just use 1 stick of mem (if using 2) see if it works. swap with the other to make sure it is bad. you also may want to try reseting the bios. look for a jumper on the MBD (recover or something like that, check the manual). put the jumper to the correct pins. itll say something to the effect of bios not properly configed or recover or some crap. turn it off, put jumper in normal mode (back to original position), boot back up and set the bios as needed. you can also try pulling the battery of the MBD but Iwould do the jumpers as the battery sometimes doesn't work.
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