Previously good running custom built PC now not giving signal to monitor or power to keyboard/mouse

Thumbs78

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Nov 1, 2013
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I built my PC back a few years ago and up until recently it ran great, the last few months I have been having problems with it turning on. At first I would have to restart it a few times before it would actually power up, all the lights and fans will come on, but no signal to the monitor and no power to keyboard or mouse. I have read multiple forums and tried just about everything short of a tear down and rebuild (removed cmos battery, waited and replaced... Pulled graphics card and reseated.... Pulled ram and reseated.... Moved ram to a different slot) nothing has worked. Looking for any other options.
My PC
Rosewill RD700 power supply
Biostar TA970 motherboard
AMD FX 8 core processor
XFX R7770 graphics card
2x4 GB Gskill ripjaw ddr3 1866 ram
1 TB Seagate barracuda hard drive

This PC was built for gaming although with a few young children now I do not do much gaming, however it was the only working PC in the house, please help.

UPDATE:
After digging out my motherboard user guide and installing the system speaker (I never bothered to install it originally) I attempted to boot up again only to be greeted by a flurry of beeping, according to my user guide that means there is an issue with my RAM, guess I'll be ordering some, hope that fixes it.

Second update:
Replacing the ram did not fix the issue, now when powering up I get 4 beeps followed by 1 short beep and then 13 more beeps. I cannot find anywhere where this pattern shows up to help troubleshoot. I'm thinking now it may be the psu, any insight would be welcome.

Third update:
Replaced the psu and it did not fix the issue, replaced the mobo and everything worked again. The new psu is nice even though the old one wasn't bad, it's fully modular and had molex connectors that my old psu didn't have. Going to try and rma that mobo seeing that it is only a year and a half old, then I'll have half the parts I need to start a new build for my daughter.
 
Solution
I would say it's a defective motherboard. For future reference, you have two memory modules and the likelihood that both modules are completely dead is very slim. Typically the motherboard is the culprit.

To test PSU:

"
Plug the power supply into the wall.

Find the big 24-ish pin connector that connects to the motherboard.

Connect the GREEN wire with the adjacent BLACK wire.

The power supply’s fan should start up. If it doesn’t then it’s dead.

If the fan starts up, then it could be the motherboard that’s dead. You can use a multimeter to check if there is power output from the power supply."

Source and pics: http://www.howtogeek.com/172933/how-can-i-test-my-computers-power-supply/
I would say it's a defective motherboard. For future reference, you have two memory modules and the likelihood that both modules are completely dead is very slim. Typically the motherboard is the culprit.

To test PSU:

"
Plug the power supply into the wall.

Find the big 24-ish pin connector that connects to the motherboard.

Connect the GREEN wire with the adjacent BLACK wire.

The power supply’s fan should start up. If it doesn’t then it’s dead.

If the fan starts up, then it could be the motherboard that’s dead. You can use a multimeter to check if there is power output from the power supply."

Source and pics: http://www.howtogeek.com/172933/how-can-i-test-my-computers-power-supply/
 
Solution

Thumbs78

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Nov 1, 2013
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All the fans start when the power is turned on, including the psu fan. I'm wondering if the psu is generating enough power to get those running but not enough to get everything else going. Would this test show different results?
I've already ordered a new psu, upgrading to Rosewill hive-1000 fully modular atx12v.
If that doesn't fix I guess the mobo is next, just hoping it was something easy and relatively cheap and easy to replace, really didn't want to do a complete rebuild.
Thank you for your insight, will update after new psu comes in.
 

Thumbs78

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Nov 1, 2013
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So if I'm interpreting correctly, the fact that all the fans spin when power is turned on is a sign that it is in fact functioning and it is looking more likely to be a mobo issue?