I have 2 computers PC1 and PC21) PC1 can't boot from CD-ROM or USB, the only way is to boot from LAN2) PC2 is runing debian jessie (which I want to use as server) and contains the Iso image debian8.iso, How to install debian jessie on my PC1 through LAN using the debian8.iso ?
How to install debian through LAN?
linux;debian;system installation;lan
You could build a PXE Boot server.  You can do this using several operating systems, including Debian.PC2 is configured as a PXE Boot server, potentially using resources from the ISO image.  PC1 is then configured in the BIOS to boot from those resources.There's a lot of stuff required on PC2 to support this, and PC1 needs to support network booting from the BIOS as well.There's a long write-up on the Debian Wiki, I'll try to summarise it (but the process is quite complex).PC2 is your Server.You need to install a DHCP service on your server, and configure it to allow booting.You need to install a TFTP service on your server.You need to get a network boot image, and configure it as a resource within the TFTP service.  You can do this using apt on PC2 (the package is known as debian-installer-$VERSION-netboot-$ARCH where $VERSION in your case is 8 and $ARCH needs to match your target machines architecture).On your client (PC1) you need to configure the network boot to point at PC2, reboot PC1 and if you've got everything configured correctly it should boot.Read the Wiki I linked, it has more detail.