Our current server is crashing several times a day!

After checking RAM and other obvious things - I think we need to retire the

My options seem a bit limited......

We have a good backup of user data from Saturday - (the server has been
giving problems for about two weeks)
We have a new Server box and I was going to setup migration on sunday but
server keeps crashing

Now the server stays up for 30 mins to an hour and everything GW etc seem
Due to the length of time I can't do a migration

Any ideas welcome?