This is the context:I have a laptop with one hd which contains 4 partitions:2 for windows: (hd0,1), (hd0,2) -> For windows 72 for linux: (hd0,3), (hd0,4) -> For linux (logical partitions).The current real bootloader (in the MBR I mean) is the windows one.Behind, I use grub2win for specific purposes, and I would use it to chainload grub2 which is on (hd0,3).Here is the entry I added in grub.cfg to do this:menuentry 'Chainloader 3' {   insmod chain   set root=(hd0,3)   chainloader +1}Unhappily, when I try to use it, I just have nothing, a black screen without any error, and I really don't know what to do more.Here is the result of fdisk -l:Disk /dev/sda: 320.1 GB, 320072933376 bytes255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 4096 bytesI/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk identifier: 0xa2c2c4f8Device Boot      Start         End      Blocks   Id  System/dev/sda1   *        2048   209717247   104857600    7  HPFS/NTFS/exFAT/dev/sda2       209717248   420339711   105311232    7  HPFS/NTFS/exFAT/dev/sda3       420341758   625141759   102400001    5  ExtendedPartition 3 does not start on physical sector boundary./dev/sda5       420341760   615651327    97654784   83  Linux/dev/sda6       615653376   625141759     4744192   82  Linux swap / Solaris
chainload multiple grub2 bootloaders
grub2;boot loader