New to the site, and I am having a little problem. My wife's Macbook has me stumped. It was working fine, (running Mavericks) and then just powered off. On powering back on we are now treated to a blank grey screen. I attempted resetting the PVRAM, and now we have the chime back, but still the grey screen, nothing else. So far I have attempted safe boot, verbose boot, single-user mode and I still have the grey screen.
I attempted to boot from my back USB, via the startup manager, and bootable media (c key) and same outcome... gray screen.
With the macbook being a few years old, and so far I've already replaced multiple parts (screen/power board/RAM) and with the Apple Care long gone, I really don't want to take it back to Apple. Last time we took it there, they wanted $800 to fix it, and it ended up costing me $10. Any suggestions are appreciated, as I will try anything to get it up and running again.