Cannot start installation

Hey everyone. very 1st post.

wanna get Openmediavault on my NAS. I used to have nas4free on it, but debian suits better my needs.

tried downloading iso 2ice, burned to disk and usb through unetbootin. all my tries come to this. i Boot on my nas from USB and get stuck to a flashing Underscore after the "SYSLINUX 4.02 ... "
any help?
i am using the x64 image as it is supported by my hardware (MOBO-CPU FOXCONN 45CS x64- Intel(R)Atom CPU 230 @ 1.60GHz | RAM: 2Gb ddr2 Kingston HyperX 800mhz)

any help?

thank you in advance
Dimitris

thanx alot for the quick answer. it was the serial port

omv on my browser now

i will be running OMV from usb stick for now. any optimisation i need to do to reduce writes on the drive? didnt find any guides around. just a opt_usb_ovm.sh

Well my current hardware provides only 2 sata ports and 1 pci. the 2 satas are populated by my 2x1tb disks which are mirrored, and the PCI port i was thinking to put a gbit ethernet card. these being said, and not having currently the funds to upgrade hardware, my only solution is USB stick, or HDD on a usb2sata converter. im open on ideas

Can I reinstall to sata disk without having to rebuild the raid?