I have an Aastra 55i that doesn't boot. When I plug it in the lights all light up as normal when it boots, but then they don't go off and the Aastra screen never comes up. Any ideas?

Try logging on to the web interface and doing a factory reset

check to see if all the connectors are plugged in properly

were you able to get this working? hat did you have to do?

several things come to mind. If you are positive the6850 is good then my first guess would be your power supply. the specs for this card says it needs a500 watt or greater p.s. if the p.s. is good then check your Pci slot to verify it is a pcix 16, nd lastly this card also requires 1 gig system memory. try this and let me k now if it doesn't work

Unplug all of your RAM, expansion cards and IDE/SATA devices. Leave only the processor and the CPU/heatsink plugged in, now try turning it on. If it boots, you should get a ram error, which is normal. If it doesn't boot, either the board, processor, or power supply is bad. Next, reinstall the RAM and start it up again. If it boots again, keep adding parts until you find the one that is causing the problem.

Hope this helps.

Open the boot, then remove the cover of the back light then replace the bulb.

You have to go to the nearest service center

Due to certain viruses or faulty drivers your boot image is deleted or prohibited from normal booting.Insert OS setup dosc and repair startup.
or perform a clean installation of OS

Check the power supply..