A blue screen is not a malfunction in itself. It is Windows detecting something so wrong that continuing risks damaging data, and halting on purpose. The important thing is on the screen and almost everyone misses it.
Read the stop code
Under the sad face there is a line like CRITICAL_PROCESS_DIED or PAGE_FAULT_IN_NONPAGED_AREA. Photograph it. That name is the difference between a diagnosis and guesswork, and it is the first thing any technician will ask for.
The pattern matters more than any single crash
- Once, ever — usually noise. A driver hiccup. Note the code and move on.
- Always doing the same thing — printing, plugging in a device, opening one program — that names the culprit. Almost always a driver.
- Random and increasingly frequent — this is the one to take seriously. Failing memory or a failing drive both look like this.
- Under load only — gaming, video, anything heavy — points at overheating or a power supply that cannot hold up.
What to try
- Undo the newest change. New hardware, a new driver, a new program right before it started is the likeliest cause. Windows keeps driver rollback for exactly this.
- Run the memory test. Search for "Windows Memory Diagnostic". It reboots and tests RAM. Faulty memory causes crashes that look completely random, and it is cheap to replace.
- Check the drive. Open Command Prompt as administrator and run chkdsk /f. A failing drive produces crashes and, shortly afterwards, lost files.
- Update or roll back graphics drivers, the most common single source of blue screens.
Back up first, diagnose second
If crashes are getting more frequent, copy your files off the machine before troubleshooting anything. Two of the common causes — a failing drive and failing memory — can take your data with them, and they rarely give much warning between "occasional crash" and "will not start".
If any of this is beyond where you want to go on your own, a Koadi technician can take it from here — remotely anywhere in the US, or on-site in New Jersey, New York and Pennsylvania. Describe the problem in your own words and someone who does this every day will pick it up.