replaced motherboard (ASUS PTGD1-LA) problems strange

[evilredking]

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,

[uddarts]

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.

http://www.hardwareheaven.com/guides/testingPSU/

ud