Here is Kingston recommend for your board
If we cannot solve this, your best line of approach is to email kingston support and email asus support - raising a support ticket with Asus. to seek advice from them.
Thdere is no better adviser on ram than the motherboard and/or ram manmufacturer
Kingston do not list that ram.
However I am not suggesting that this would stop it posting
IF XP was installed on the OTHER computer it is very unlikely it will work on this one, as the chipset drivers loaded when XP was installed, the graphics etc are NOT the same.
My advice now is to see this
check your build against the advice and ALSO did you ensurewhen inserting, especially the main power connection to the board, that you supported the board, under the edge whilst doing so, the connection is freqnently requring of some force to connect and it is easy to damage the board
If you find nothing wrong there, checking against the guide and especially the usb headers to the front ports and the front audio connectors
then by the time you return I will have posted the next test