Acer Aspire 5750Z doesn't start

[Karol]

In most cases it does't even start, don't see anything.
I took out the battery, it works on the AC adapter.
On a few trials, the laptop starts and for a few seconds the windows blue window logon appears and disappears. the resolution, in those few seconds, appears low.
I can't enter BIOS with F2.
It doesn't start from the CD, from a bootable disk.
Only on the few cases, when i see the windows logon, the hard disk indicator light lights.