My PC displays only when I restart it manually

One week ago, I pushed the computer case by a mistake and It fall down on the desk. I tried to start the PC and It started up normally but there was nothing on the screen. I restarted it a few times til it worked. In the beginning, I thought there was a problem with my graphics card but now I'm pretty sure It's not the issue. Because the monitor works fine with another device and the keyboard NUMLOCK button responds normally to my orders when I press it. Maybe there's still an issue with the graphic card so I asked this question in the graphics section because I don't know where else can I ask about it regarding this issue.

Here's my previous thread:

I installed Windows 8 preview release and everything worked fine til somehow I pushed the computer case and it fell all over the desk and caused the PC monitor and speakers to fall too. I picked up everything and respositioned them. I started the computer case and the computer seemed to be working and even the keyboard NumLock button responded but there was nothing on the screen. I connected my Xbox to the monitor and it seemed to be working fine. After a few attempts it worked again but I had to restart the PC a few times. Today it didn't work and I tried restarting with no good results, I was afraid to ruin the operation system files so I had to open the computer case to see what's wrong with it. It was full of dust and I cleaned it a little bit with a few tissues because I don't have compressed air can and don't know where can I get in Cairo, Egypt. The dust seemed to be not the issue, PC monitor, motherboard nor the hard disk. I remembered that I have built-in graphics card so I plugged in the VGA cable and it worked but I don't think that It can run my video games so what can I do to fix the graphics card? And If I need a new one, can you please state a graphics card that would run the latest video games like Battlefield 3, Crysis 3 and GTA V on the highest graphics with more details on the required power supply and motherboard for it? Thanks a lot.
Processor: Intel(R) Core(TM2 Duo CPU E8290 @ 2.83GHz 2.83 GHz
Installed memory (RAM): 4.00 GB
System type: 64-bit Operation System

PS: EVEREST didn't show up my motherboard information nor the power supply.
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More about displays restart manually
  1. If you have inbuilt graphics,
    Ican't play games Like Battlefield, GTA 5 ( Im also eagerly waiting for GTA 5).

    I recommend to buy XFX Radeon HD 7790 2gb Black Edition overclocked.

    Its the best a low price 180$.
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