Is this motherboard compatible? dell optiplex 280

Hi all,

so recently my old pc broke down, took it to a shop and he basically confirmed it was a motherboard problem, so i thought id order a replacement,
the old one was this gigabyte ( http://www.gigabyte.com/products/p [...] 10&dl=1#sp )
and the new one is a dell optiplex 280 ( http://www.levnapc.cz/ProductsFile [...] fikace.pdf )

anyways so i go back to the guy to put it together, and he says its not compatible. i.e. it wont work, i looked at it myself, and as far as i can see the only thing thats not compatible is the heatsink, and i can get a new one of those no problem.
apparently hes been working with computers for 15 years, so maybe hes right. but honestly i dont see what is incompatible here. maybe you guys can shed some light?

btw, its a pentium 4 ht processor, 1gb ram, IDE HDD, nothing special

The dell board has an older 915 chipset which may not work with your cpu or ram. You need to match not only the cpu but the ram to a replacement board. If you don't know how to change out a board, I would look for a used p4 or core2 duo system on craigslist so you don't have to pay someone more for labor.

my case is a normal case, and my old mobo was the same form factor so its ok, their both ddr2 ram... guess ill just have to return it and get the exact same board. seems like a waste of money, spending 30 pounds on a system that cost 60. might aswell put that towards a decent new build.

is it worth trying the board out? will it get damaged at all? its definetly got the right socket and ram, thats for sure.

ok, i will ask, at the time he kinda just said 'oh it wont fit' but ok. thanks for the help mhokett and o1die, ill get it checked out by a second person. then go from there.