Z87-PRO A0 Q Code, no display

[RedSoxFan1968]

motherboard: Z87-PRO
RAM: two 4GB sticks (crucial, 4GB DDR3-1333 (PC3 1060) UDIM)
CUP: Intel G3258 LGA1150
NO video/graphics card

Built this system for my parents 4 years ago. Suddenly, they report it is "dead". Upon bootup, I get a single beep, fans running, then A0 Q Code, and no display.

I have tried:
Switched to known-good VGA cable to existing monitor,
Switched to known-good monitor with known-good cables (DVI, VGA, and HDMI)
removed wireless keyboard/mouse, replaced with known good wired keyboard
Removed CMOS battery for 5 minutes, replaced, then re-boot
Re-seated RAM, then re-boot
Removed 2nd stick of RAM (leaving single stick in A2), then re-boot
Swapped RAM sticks, leaving single stick in A2), then re-boot
Return RAM sticks to original configuration, then re-boot

Each of the above result in the same problem - single boot, fans running, A0, and no display.

Suggestions???

 

[Calvin7]

Z87 is 2013 model Chipset. You may need a new CMOS battery.

I would try another power supply if new battery doesn't resolve problem.

 

[RedSoxFan1968]

Thanks for the reply, Calvin7. I checked the CMOS battery, and it is OK. So, I took it to my local, trusted PC repair shop. They quickly identified that the boot order had somehow gotten switched (not sure how that happened), so it was never getting to the HD. Since nothing at all was showing up on the monitor, I had no way to check this. They fixed it at no charge.

Any suggestions on how to ensure this does not happen again?

Z87 is 2013 model Chipset. You may need a new CMOS battery.

I would try another power supply if new battery doesn't resolve problem.