Regarding replacing Intel logo image:
In the motherboard product guide/specifications I remember to have read the option to replace the Intel Logo by any other image, provided that image is in a particular form i.e flash image. Will have to recheck correctly.
I did try but failed to convert the jpg image to flash image about a year back.
HP uses their own BIOS and you can't change it and NEVER FLASH any other BIOS that's not HP you will make a door stop.