system admin - check server and fix problems

I need and expert to check what is wrong with 2 of my servers, becoming unresponsive. Error began early today on both server - might be some security exploit. servers are runing on debian OS i am willing to pay $100 for a fix, i assume this is a quick job for expert system admin (i do not know anything about doing this by myself) please only bid if you have over 20 positiver ratings and if you can start right away 100% escrow will be created