ACER ASPIRE M1201- Tower boots up, LED power light
Cylinder Icon Usually = HARD DRIVE ACTIVITY!
PULL SIDE OFF of computer, CHECK BOTH ENDS OF sata CABLES if THE HARD DRIVES ARE sata, IF not, CHECK THE CONNECTORS, NO MATTER THE TYPE. also, CHECK THE POWER CONNECTORS. Those SATA connectors are FAMOUS for coming JUST loose enough to NOT work, but LOOK like they are plugged in, Make CERTAIN computer is UNPLUGGED, and YOU ground yourself to computer before sticking your paws in computer., CAN cost u a lot of money. A LOT of those ar e HOT plug, but, don't find out the hard way!
Just MOVING the computer can loosen the SATA connector enough to not work. CAREFUL, I always reseat all cables, video card, memory, other cards, JUST to be certain after a move. AND, HEATSINKS/CPUs. Actually, just Heatsinks, CPU's are pretty safe. IF you pull Heatsink off, clean off the heatsink and CPU surface of thermal paste,l and replace wtih a minimal amount of Thermal Paste, Aprrox. .003"
Robert Two Bears, PhD