Try reseating the RAM and seeing the age of the system,  I would definitely replace the CMOS (coin cell) battery. Leave the old one out of the system for 15 minutes before installing a brand new recently purchased battery.
Hey all, I've got an old beefy M17x R4 that I hadn't used in a few years but just started to again recently.  When I hit the power button, it starts beeping.  I have to hold the power button down to force it off, then press it again to power on--then it boots up and runs perfectly.  Any idea what's going on here though and a fix?  It shouldn't have some warning beep or whatever's going on when I first try to boot it up.     Thanks in advance!
M17x R4, beeping at Power-up