Problems with the RAM

Good day, recently there was such problem was Windows 7 64bit originally had 4 GB 2 laths on 2GB (Hynix 2Gb DDR2-800 PC6400).
Decided to increase the RAM ordered from aliexpress 2 laths on 2 GB, RAM has been working for 4 months flawlessly, then it began to pop up a blue screen of death with error 0x00000019: BAD_POOL_HEADER and 0x0000001A: MEMORY_MANAGEMENT tried to pull out all the RAM and insert it again the result is 0 overthrown the BIOS to default(factory) settings is also zero reaction, rearranged laths in places too, with no results.Only worked with this method completely disconnected the computer from the outlet and set the memory, turned the computer on after I turned on the game the computer worked for a while 20-30 minutes and again gave the blue screen.Demolished Windu put 8.1 still the same problem put the memory of the computer turn on, do a reboot to check everything is OK and computer hangs on the splash screen with the logo of the motherboard to any keys does not react. Motherboard Gigabyte ga-ma770-ud3 rev 2.0 RAM photo make