BSOD Issues Unsolved For A Long Time

Because you've had some BSOD-less crashes I want to know what the state of your hard drive is.
Please follow below instructions.

Diagnostics Test

 HDD TEST

Run SeaTools to check the integrity of your HDD. SeaTools for DOS and Windows - How to Use - Windows 7 Help Forums
Run following tests

1. Short Drive Self Test
2. Short generic
3. Long generic

If the short generic fails, no need for the long generic.

   Note

Do not run SeaTools on an SSD as the results will be invalid.

Run chkdsk
Disk Check - Windows 7 Help Forums

Run HDTune to

• scan for errors, no quick scan but full scan
• check the health,
• benchmark.

It may take some time, but please take the time you need to perform it properly.
Let me know what the results are

• of the error scan,
• make a screenshot of the health of every hard drive and post the screenshots,
• post screenshots with the benchmark of the
  
  • transfer rate,
  • access time,
  • burst rate,
  • cpu usage.

A software (stress) test for the CPU, assuming that when you tried to boot into safe mode the GPU wasn't included we can ignore the GPU.
If this doesn't provide what we want to see, the cause, then you may have to strip down your system.
There are 4 software tests, for the GPU, RAM, CPU & hard drives, for the other components you have to replace them to test them, with the PSU you can test the voltages also.

Unfortunately I'm a bit limited in giving support when it comes to hardware, if required I'll ask someone to come in for it :)

Diagnostic Test

 CPU TEST

Run Prime95 and/or IntelBurnTest to stress test your CPU. Prime95 - Stress Test Your CPU - Windows 10 Forums & CPU - Stress Test Using IntelBurnTest - Windows 7 Help Forums

   Note

If you're overclocking anything, please stop it and set everything back to default while troubleshooting

   Warning

Your CPU temperatures will rise quickly while under this stress test. Keep a keen eye on them and abort the test if overheating occurs.

Had two BSOD-less crashes just now in quick succession, even though yesterday nothing happened. I'll try to do the CPU test tomorrow though I'm a bit pressed for time with exams.

And to add insult to injury, I had a system freeze too.

Could you give some description about what happens and what you're doing when they happen everytime? That may help to identify the cause, it has in a lot of situations.

How many programs are open at the time of the crash?

Could you make screenshots/photos of the taskmanager tab 'Processes' filtered on 3 processes, CPU, Memory & Disk, just a few seconds before a crash happens? If you can please post it.

Keep taskmanager running when you startup, this might make it easier to catch :)

Try to run 2 programs at the same time as max for now, a program of choice and taskmanager.