So I went on a 3 week trip and I come back and my PC won't output any signal whatsoever to my monitor but it will turn on. I have tried resseting the CMOS, and I have also tried a different monitor. I am using a VGA cord with a dvi adapter. I have a gigabyte r9 280.
Have you had your pc pluged in while you wherr away?
A couple of easy process-of-elimination diagnostics:
Confirm that the 280 is spinning up when the machine powers on--dead card?
Use a different output on the card/different cable--port/cable problem?
If you have integrated graphics on your cpu, disconnect the card and attempt to use the ig--card problem?
Analog cables have some fiddly components, and you're doing some nontrivial adapting, so I personally would focus my troubleshooting around the cable first.
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This is the most likely cause. Leaving electronic devices plugged in can cause a static build up preventing boot. If you disconnect the power and hold the power button down for 10-20 seconds it should allow this static to dissipate. Once done, plug back in and attempt to boot. This can also happen to monitors so try that after if this fails.
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That, and during that time there also can be an spike or some other issue with the power. That can damaged an component (most likely the PSU). but @shoring_fragments is also an good point to start.
Has happened, updated mobo BIOS with USB stick and problem solved for good.