Trouble with PC lockups (Screen and Sound stuck),

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   Hey everyone,

I'm having trouble with my PC, which is set up as followed:
Motherboard: ASRock H77 Pro4/MVP 1155 Socket
CPU: Intel(R) Core i5-3570K CPU @ 3.40GHz
RAM: Corsair Vengeance LP DDR3-1600 4x4GB
PSU: BeQuiet Straight Power 10 500W 
Storage: Samsung SSD 830 Series 256 GB + Seagate HDD ST2000DM006-2DM164 2TB
I also had a Sapphire Radeon R9 290X Vapor-X Tri-X 8GB, which is now broken. The PC does not post with it plugged in, even in different machines.
I'm experiencing frequent lockups that make using the machine for anything other than browsing unusable. The lockups freeze the screen and the sound loops until I restart it. It may happen once a day if I'm just browsing, or every few hours in 2D games, while 3D games lockup in the first hour. 

I have checked the following things:
Event Viewer in Windows: Loses the past 20-30 minutes of infos after freezing 
Checked cables: Seems OK
Temperatures: OK
CPU stress test via Prime64: No lockup after a full night of testing
Memtest + Checked each RAM unit one after another
Checked voltages in HWMonitor: not sure what to look for here, any tips?
My assumption is that the motherboard somehow fried the graphics card with the lockups. I can't find out exactly though.
However, I had an old Gigabyte 8600GT lying around which has been running Team Fortress 2 + Youtube videos for the past 5 and a half hours. This should usually crash within the first hour, but not always so I will definitely keep testing. Assuming this fixed it however, how would that be possible? The lockups occured when the R9 was still working, and then without any GPU installed at all. Why would they now be (possibly) happening less or not at all? I should also mention at this point that I now only have one monitor plugged in via DVI, before that it was one via HDMI and one via DVI. Do you have any ideas that could help me pinpoint the component causing the problem? If it is the motherboard, would it make sense to just get an old 1155 socket board from somewhere and replace the graphics card?

Any help is highly appreciated. If I forgot anything let me know.

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SirCrimson Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23 Dec 2018 Status: Offline Points: 3	Post Options Post Reply Quote SirCrimson Report Post Thanks(0) Quote Reply Topic: Trouble with PC lockups (Screen and Sound stuck), Posted: 23 Dec 2018 at 1:34am
	Hey everyone, I'm having trouble with my PC, which is set up as followed: Motherboard: ASRock H77 Pro4/MVP 1155 Socket CPU: Intel(R) Core i5-3570K CPU @ 3.40GHz RAM: Corsair Vengeance LP DDR3-1600 4x4GB PSU: BeQuiet Straight Power 10 500W Storage: Samsung SSD 830 Series 256 GB + Seagate HDD ST2000DM006-2DM164 2TB I also had a Sapphire Radeon R9 290X Vapor-X Tri-X 8GB, which is now broken. The PC does not post with it plugged in, even in different machines. I'm experiencing frequent lockups that make using the machine for anything other than browsing unusable. The lockups freeze the screen and the sound loops until I restart it. It may happen once a day if I'm just browsing, or every few hours in 2D games, while 3D games lockup in the first hour. I have checked the following things: Event Viewer in Windows: Loses the past 20-30 minutes of infos after freezing Checked cables: Seems OK Temperatures: OK CPU stress test via Prime64: No lockup after a full night of testing Memtest + Checked each RAM unit one after another Checked voltages in HWMonitor: not sure what to look for here, any tips? My assumption is that the motherboard somehow fried the graphics card with the lockups. I can't find out exactly though. However, I had an old Gigabyte 8600GT lying around which has been running Team Fortress 2 + Youtube videos for the past 5 and a half hours. This should usually crash within the first hour, but not always so I will definitely keep testing. Assuming this fixed it however, how would that be possible? The lockups occured when the R9 was still working, and then without any GPU installed at all. Why would they now be (possibly) happening less or not at all? I should also mention at this point that I now only have one monitor plugged in via DVI, before that it was one via HDMI and one via DVI. Do you have any ideas that could help me pinpoint the component causing the problem? If it is the motherboard, would it make sense to just get an old 1155 socket board from somewhere and replace the graphics card? Any help is highly appreciated. If I forgot anything let me know.