Hmm. Two weeks ago my Asus mobo detected surges and shutdown. I cleaned up the psu fan and cabinet filter ( had dust built up) and it's fine since then.Thats probably a failing PSU. In my other PC, I have a dead corsair 750TX. For many months, I had to press the power button like 5 6 times to start it. One day, the PC refused to start. Turned out my PSU was dead. Just letting it out here. Its a possibility.
Its Antec 750W PSU.Which psu do you have? And I hope you don't cover your tower with anything to save it from dust?
You need this Bosch GBL 620-Watt Air Blower (Blue) https://www.amazon.in/dp/B074Z6B35N/ref=cm_sw_r_cp_apa_i_ejM8DbAFFZVGD
Hair dryer will be too hot and may damage the components. The amount of dust there, it requires a blower or compressed air. You can also use the blower in vacum cleaner in short burst to clear the dust and later use isopropyl alcohol to wipe out the dirt.
When was the last time you cleaned that system? Such a nice full tower and blanketed in dust. Sad.Its Antec 750W PSU.
Check attached screenshots for dust accumalated inside/outside PC,
I dont cover my tower with anything, infact the door on wall side is kept open.