Is my cpu dead??

James79

Member
I had recently bought a new power supply because my old PSU (antec 650 watts)went up in smokes like there was a fire about to start (the rest of the hardware components were not effected). Once I installed the new PSU(antec 550 watts), the cpu was overclocked, not by much like 10% (from 4.0ghz factory clock to 4.1ghz). Memory is set to 100mhz to obtain the 1600mhz 8gigs. Cpu is an Intel i7 4790k. It booted up fine after intial login of Linux and then all of a sudden it shutdown. It will only boot up without the 8 pin connector for the cpu with no video (integrated video from the motherboard).

Once I connect the 8 pin connector for the cpu, it doesn't boot up. What do you think is the problem? Cpu or Motherboard. I already tried use one ram of stick and reset the bios through the jumper connector on the motherboard.
 

porterjw

Spaminator
Staff member
How do you know the rest of the hardware wasn't affected? What caused the smoke/fire? If an actual surge and/or the PSU failed internally and sent unregulated voltage, then you could absolutely fry other parts.

Unplug it and pull the CMOS battery, then wait 30 seconds to insure complete power dissipation. Put the battery back and plug it in then try it.
 

James79

Member
What cause the smoke of my old PSU, I don't know....smoke just begun to come out of it so I turn my computer off immediately when that happened.

When I booted up completely with the new PSU all the hardware appeared working (everything came up during POST) that's why I believe the other hardware components weren't harmed but maybe they were.

I just took out the cmos battery and put it back in and still doesn't start up.
 
When a power supply goes up in smoke, there is a high possibility of a power surge through the motherboard. Usually it only takes out a few caps/resistors, but those can be difficult to know which ones unless you have some sort of knowledge of using a multimeter and knowing how to read the schematics. It may have worked the first time, but that little bit of power that went through when you booted with the new PSU; it 'may' have finished off your motherboard. I think, and I could be wrong here too, that the CPU is probably OK. There is so much protection the motherboard has that it usually is the motherboard to go first before it will kill the CPU.

With that being said, make sure you go back, and disconnect/remove everything from the motherboard, and start again double checking and making sure every plug is in the right spot. Then try to power it up again.
 

James79

Member
Not to be a pain but when I first booted my computer with the new psu, everything was securely in place. Are you recommending to do this to see if it's the motherboard or a cpu issue. I'm just extra cautious about taking the CPU out of the socket as it's easy to damage the pins as I've already done it once before and had to let a technician install it for me.
 
I already tried use one ram of stick and reset the bios through the jumper connector on the motherboard.

I believe he already answered this in first post. Maybe doing the battery removal reset CMOS process.....

Not to be a pain but when I first booted my computer with the new psu, everything was securely in place. Are you recommending to do this to see if it's the motherboard or a cpu issue. I'm just extra cautious about taking the CPU out of the socket as it's easy to damage the pins as I've already done it once before and had to let a technician install it for me.

You should be OK leaving the CPU in the motherboard. The main thing to make sure all the wires and plugs are in the correct spots and fully in position. Recheck the power switch connections to the motherboard.
 

James79

Member
Today, I finally was able to turn my computer on with the 8 pin CPU connector in. Now it won't boot the video nor do I see the hard drive activity light flashing showing the hard drive being active. Any suggestions?? I'm going to try to remove just the memory and see what happens.
 

James79

Member
I tried my back up video card and still no video.

Keyboard and mouse are not lit up either. You guys think it's a bad motherboard???
 

James79

Member
Finally got it to work...my onboard video doesn't work (strange and weird) so I'm using a NVIDIA GS8400 AGP Card. Looks like I'm gonna have to shop for a good video card now, any suggestions on what to go with. Not a big gamer. just a card with good graphics for (KODI Player, Netflix, Website Development, Email, etc)
 

beers

Moderator
Staff member
Are we still talking about the same sig rig system? AGP hasn't been a feature on boards since the mid 2000s..

Card wise, anything should be able to do that for you in a 2d environment, even the current 8400.
 
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