When i connect the power cord it comes on by itself and nothing happens i here the HHD come on but no bios screen or any thing else i build computers so nothing obvious unless you think i could have missed it help please,
is the replacement mb identical?
one possibility could be a weak power supply.
it can be checked by using a digital multimeter on a 4 wire molex as shown at the bottom of the following link.
Last edited by uddarts; 11-30-2012 at 08:47 PM.