Troubleshoot- graphics card? Power supply?

Scrolling through pics of FB, click on yet anither, PC makes a 'clicjk'. gray screen of death. Restart on 'safe mode', graphics are pixelated and no sound but works otherwise. Will restart normally if I first shut off PS w/ it's switch, hit start, fan spins a little to bleed capacitors. Turn on PS and then restarts OK. Until I click on a graphic-intense site or You-tube. Then gray screen of death.

Re-seat graphics card no help. Hmm, reseat memory sticks maybe?

Machine is +/- 2012. Capacitor plague in PS perhaps?

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