Long story short. I got the famous Acer Black Screen of Death. Found out that the problem was that it has the corrupted bios. Looks like it can be only recovered with Fn+Esc thingy.
Ok, I got the laptop with DOS loaded when it came.
But I'm pretty sure that it has UEFI not the legacy BIOS.
The thing is I tried to put the 2.xx version Q5WV1X64.fd file and try that Fn+Esc thing, it beeps for 3 times and restarts the laptop. That's it. It stays on forever.
I also tried to put the 1.xx version Q5WV1X64.fd file and tried the same. It resulted same with that 3 beeps and restarts.
Doesn't matter which version of .fd file I put in. I tried every BIOS that is listed on E1-531 product page. Same result.
And the other thing is the memory is working super fine. I tried it on another laptop and ran the Mem86 test and it's good. Also I pulled out the CMOS battery for 10 mins then I thought it'd reset, but it didn't. I tried the CMOS shorting method. No result too.
Help me out here. I feel like I gave all the enough details.