My MacBook Pro does not pass the startup grey screen. When I try to do a reinstall the computer doesn't even read the disk. I can't even boot in safe mode. I'm being told that it MAY be a motherboard issue, I'm just wondering has anyone else had this prob

MimiBrooks,

try booting your MacBook Pro into Recovery mode by holding down a Command key and the R key as it starts up. Once the Mac OS X Utilities menu appears, select Disk Utility. On the left-hand side of the Disk Utility window, select your internal disk’s boot partition (typically called “Macintosh HD”). On the right-hand side, press the Verify Disk button if it’s not greyed out; if it is greyed out, or if it reports that errors were found, press the Repair Disk button. Once the verification/repair is completed, exit Disk Utility and select Restart from the Apple menu to restart in normal mode. Does it get past the grey startup screen now?