ora: 1033 : Oracle intialization or shutdown in progress

i am using oracle 10g and i could not sign in using sql plus ,it gives the error ora:1033 (oracle initialization or shutdown in progress). At least i know what causes this error. As suggested by different people i waited for more than 3 hours but did not get it right.

I tried using 10g enterprise url... at least i could log in as sys , there are two option startup and perform recovery..... i tried startup... but the problem was same....... i also tried restaring the services again it don't work for me.....

can anyone tell me how could i log on using sqlplus..... and beside improper shuntdown and power down what other thing causes this error......

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