Laptop crashes! Need help please

This week my 4 year old laptop hp pavalion dv6 laptop started crashing. Then I started trying to find the problem and fix it.

First, I checked my drive c on the mistakes and done a Defrag. My computer has no problems with these tasks.

Secondly, I checked my computer on virus. I used malwarebytes and avast to scan my pc. Here, too, there where no problems found.

Finally, I formatted my pc and reinstalled windows 7 again. It was a little difficult because it kept crashing, but after some time I managed to pull it off. Now, my pc works fine but on the strangest moments, it crashes. For example when I do nothing and wait for 2 minutes, it crashes. But if I continue to work on it without running all heavy and just programs using the internet it does not crash for at least an hour or more.

When my pc it blocks just gives a black screen and numlock/shiftlock lights are flashing. Also downstairs there is an orange light flashing hard drive logo.

After a reboot hard, I can use my pc again and it's as if nothing happened.

I am engineering student in the last year and I need my pc to school daily.

Please can someone help me to try to solve this problem?

If these are your time I'm scared, I agree; It's look like a motherboard problem; for example the GPU.

Tags: Notebooks

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