Automated teller machine help please

Hi all,
i m trying to make a program (client/server) of a Automated teller
machine talking with its bank server. i did it using 3 files, a
client,
a server and an application. the program contains 2 bugs that i
woud like you to help me solve them

1- the program take random choice for working or not which is too
weird to me (i m a beginer)
the program may work for one time properly, then not then yes,
eventhough i compile everytime.
eventhough i know that this is not something possible in programming
terms, but indeed it is highly possible to compile, try to run and it
breaks and after 1 minute, compile again and run nicely

2- whenever i enter a right value, i go to the right step if i enter
the password before the username it will not prompt me about a user
name . Instead, in case the pass i give is the right one, i go to the
next step
which is "main menu", what i want is to go step by step the
procedure,
like if anything except the UserName was given even a right pass. the
program shall not take it, it should remain in the UserName step
untill entered correctly

for this, i suppose the problem is in the IF statements but i m not
sure how to fix them so i will show you what are the 'IF' i m using
on
both sides and if you can, please help!

Fom the client side:
                modifiedsentence = inFromServer.readLine();
                String onoma = "MyBank";
                String onoma1 = "MyName";
                String Pass = "MyPass";

                if (modifiedsentence.equalsIgnoreCase(onoma))
                {
                        System.out.println("Enter your User Name");
                }
                if (modifiedsentence.equalsIgnoreCase(onoma1))
                {
                        System.out.println("Enter your Password");
                }
                if (modifiedsentence.equalsIgnoreCase(Pass))
                {
                        System.out.println(" ");
                        System.out.println("MAIN MENU");
                        System.out.println("---------");
                        System.out.println("* w for Withdrawal");
                        System.out.println("* d for Deposit");
                        System.out.println("* c for check Balance");

// here the program wil run the third file or the application file
}
---------------------------------------------------------------------------=
=AD---------------------------------------
=46rom the server side:
                clientsentence = inFromClient.readLine();
                //Ask for a cardNumber
                Accepted = clientsentence.toUpperCase() +"\n";
                NotAccepted = clientsentence.toUpperCase() +" is NOT
accepted "+
"\n";
                String Nom = "MyBank";
                String PreNom = "MyName";
                String PassWord = "MyPass";

                if (clientsentence.equalsIgnoreCase(Nom))
                {
                        outToClient.writeBytes(Accepted);
                }
                if (clientsentence.equalsIgnoreCase(PreNom))
                {
                        outToClient.writeBytes(Accepted);
                }
                if (clientsentence.equalsIgnoreCase(PassWord))
                {
                        outToClient.writeBytes(Accepted);
                }
                else
                {
                outToClient.writeBytes(NotAccepted);
                }
==========================
==========================
========
i m pretty sure the problem is here so i must nest 'IF' in some way
or
something else should be done, like making a separate readline for
each new line entered by the ATM user, i really dont know what to do
from here on, would you please help

Thank you all