[SOLVED] PC constantly shutting down randomly, is my PSU failing?

[sokoine]

I've had this PC Build since 2013, Specs are:
AMD 8350
Corsair 8GB DDR 3 ram
GTX 780
Corsair CX750M PSU
Corsair formula v motherboard
1TB SSD
Windows 10 Pro 64 bit

One day my GTX 780 was showing blue dots across the screen and my PC would shut off after 10-15 minutes. I'm using an old radeon 6850 for now but i'm still getting random shutdowns especially if i'm playing hearthstone and have multiple tabs open on a web browser, other wise it can stay on for hours without any issues if i'm just browsing the web.

These are the things i've done so far:

• Added thermal paste to CPU
• Swapped RAM on different slots
• Cleared the CMOS
• Cleaned out all dust from all components
• Set sleep options to 'Never' on power options

UPDATE Just downloaded and ran OCCT and the PC shuts down during the test

These are the readings on IDLE using HWmonitor

 

[Vic 40]

Hard to say with such an older pc , but since not their best might it be the psu. The value of the 3.3V rail is to low in hwmonitor. But it's a software tool. Can you test with another psu? Maybe from a friend or local shop .....