Topic: boot troubles on 7.0(Pre-Release) &co

[Fred3D]

hi all,
i decided to upgrade to the 7.0(Pre-Release) after some disk troubles on my server ...
i always have GRUB on screen without any error message, the system doesn't seem to boot anymore, so i decided to reinstall, format the drive, fix the mbr ... and so on, still GRUB and nothing else ...
any idea ? a boot floppy disk ? a magic command line ?
for info i have a dual celeron 500 / 768mo ram / 2940UW SCSI with a 4.5 Gb drive

2nde question by the way : is there a template/package / installation process to add ming to the SME's php library ?

thanks a lot for your help.