Re: computer freezes before booting
It must still be under warranty, I'd return it to the vendor and get them to sort it out, if you can't even get to the bios there is not much you can do.
The fact that it has progressively got worse to the point of now being virtually "useless" would point to failing hardware. At the risk of voiding your warranty you could try reseating your ram, trying one ram stick at a time, unplugging all but the most basic components e.g. 1 ram stick, vid card, HDD and see if you have any success but basically I'd look to the vendor for a warranty repair.