My Computer Freezes After Sometime

Good day!

Currently, I have been experiencing a BSOD which contains a problem like "An attempt was made to execute non-executable memory" and I got rid of that by reformatting or reinstalling my OS. But now, my computer seems to be acting strange. It freezes sometime after boot up, like the mouse will not move and etc, and i need to shut down it forcibly. But sometimes it wont turn on, like the power light is only on and no beep sound that indicates that the system will boot up successfully. And there are other times that it will shut down or restart automatically and wont successfully boot up just as stated in the previous statement.

I am just wondering if anyone out there can help me solve my recent problem. And much better if you can also help me avoid my old problem for it might come back again. And if you need to know my system information just tell me.

PS: Currently, I am running in safe mode and hope that you might help me immediately.

Thank you in advance.
DN

I suggest starting all troubleshooting with the following diagnostic tests. They'll save you a lot of time and heartache if there is a hardware failure, and you'll have the disks on hand in case you need them in the future:

H/W Diagnostics:
Please start by running these bootable hardware diagnostics:
Memory Diagnostics (read the details at the link)
HD Diagnostic (read the details at the link)

Also, please run one of these free, independent online malware scans to ensure that your current protection hasn't been compromised: Free Online AntiMalware Scanners (read the details at the link)

I do 4 things at work before I start fixing a system:
- a hard drive test
- a memory test
- a generic system test (PCCheck by Eurosoft - about $400 US)
- a test for malware

FYI - here's a description of the first error that you described: BSOD Index - STOP 0xFC
and here's one of the second error: BSOD Index - STOP 0x1A

The key description here is that you reformatted your system and still have problems. If done properly, the system should work fine if it was a software problem. Since it's not working fine, then the most likely issue is a hardware problem (although compatibility and malware can cause similar issues even after a format).

To run the diagnostics, please follow the directions step-by-step. They may appear complicated, but they are necessary in order to figure out where the problem lies. If you have questions at any particular step, please post back and ask for clarification of that step.