So, it's been a year since I added another 8GB stick of RAM. It was running OK all along and I've run Windows Memory Diagnostic
and Care Center Memory Checkup
to confirm that. Today, while I was unpacking a huge archive (.7z), the laptop display turned off (just display turned off, no sleep) and wouldn't respond. After I forced it to power off (holding the power button), it wouldn't turn back on again. There was no display backlight and the keyboard lights start flashing every 2s or so. I tried getting into the BIOS but to no avail. Then I learnt that such flashing could be caused by a RAM error so I removed the additional RAM stick and voila! It started booting normally. So I tried some combinations of RAM and the problem I arrived at doesn't seems to be quite bizarre.
- Slot 1: Stock RAM, Slot 2: Empty - Booting.
- Slot 1: Aftermarket RAM, Slot 2: Empty - Booting.
- Slot 1: Aftermarket RAM, Slot 2: Stock RAM - Booting.
- Slot 1: Stock RAM, Slot 2: Aftermarket RAM - Error.
So, the combination which was working for almost a year suddenly doesn't boot and everything else boots normally. I don't have a problem running the RAM in alternate slots, but I'm just curious as to why this might be happening.