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Laptop hardware problem, not sure what it is, need some advice
Okay, so I have a problem with my laptop. It started working against me a couple days ago.
A description of what was happening(this could be long, but please read):
I was on youtube, doing my regular work and suddenly it gave me a blue screen and crashed. I couldn't turn it on again so I started the repair. It said that it can't repair it automatically, and the error it gave me was Could not find OS files on disk (I think, I can't remember.).
I decided to do a format on the C: drive (where my windows was installed) and to reinstall windows. Everything was going fine until it restarted for the last time on Completing installation. Then it crashed again on starting windows.
I formatted the drive C: again and started the installation. This time it completed the installation and when it was turning on, it passed the "Configuring your windows for the first use" and crashed at the "Calculating video performance"(or something like that ??!). Soo I decided to format it again, and try to install Windows. This is where it started to be very slow. It took almost 30 minutes to pass the Setup is starting... screen. It was so painfull because it was so slow, but this time the installation succeeded. Then, I made a new account, it asked my name and the password I want to and it finished. When it restarted, new problems occured. My account I made in Windows Setup didn't want to accept my password. It said it was incorrect.
When I restarted my laptop, it acted like there is no account made, and it asked me for username and password, but the account picture was blank.
So then I somehow got into Safe Mode and made a new administrator account using CMD. I restarted it again and it finaly accepted the password. Now the next problem - it was painfully slow. It took 20 minutes to load explorer.exe and the Start button and all. After some time I got access to my D: drive and I saved some files. The thing I noticed was the constant HDD activity, on the light that laptop's have. HDD was working 100% all the time. I also noticed that the computer lagged aprox. every 30 seconds.
I assumed that it was the Windows Install that got corrupted somehow, so I tried to reinstall Windows AGAIN..
The installation was again crashing all the time, but every time on a different place of the installation. When I finally succeeded to install, I let it load the desktop and left it to rest for about an hour. When I came back, I saw that the HDD light was not glowing and the laptop was ordinary fast again. So I started to install drivers. In the Device Manager I went to install the VGA thing (graphic card driver.). It found it online, downloaded it and when it started to install the driver, the laptop crashed again. Then I decided to open my laptop (btw I know what I'm doing) and to clean some dust if there is any. When I put back together and turned it on, it couldn't find my hard disk. I went to do a repair and the error it gave me was "Root cause: A hard disk could not be found. If a hard disk is installed, it is not responding."
It is weird because I could see my hard disk info in my BIOS, so it recognised it.
My processor: Intel i3 2.4 GHz
RAM: 4 GB
Graphic card: Intel HD Family 1 GB
Hard Disk: Seagate Momentus Thin 500GB
Motherboard: Not sure :/
So my question is, Based on all this info, what is failing? My motherboard, HDD, Graphic card??
I really really hope it's HDD because I don't have much money. Thanks for all the advices!
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