How can I repair and speed up my Mac?

Computer really started to slow down about 6 months ago, kept buffering on everything. I added 4gb memory but this didn't really help much. I have been trying to repair via 'disk utilities, first aid' but getting message: ERROR: The underlying task reported fail:- 1HFS volume checked:- volume needs repair
What can i do?
Thanks

First, backup your HDD immediately, you might indeed have a bad harddisk.
Next, please confirm which iMac model and OS X version you are using. Your signature here says 10.4.11 - is that true?

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  • How can I repair and open damaged PDF files?

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  • My airport extreme has connected to a Tplink router, i set my AE in Create network, so i get a problem of Double NAT. How can i repair this probleme because i have to use TPlink for my IP TV and i want to use AE to creat my network and the guest NW.

    my airport extreme has connected to a Tplink router, i set my AE in Create network, so i get a problem of Double NAT. How can i repair this probleme because i have to use TPlink for my IP TV and i want to use AE to creat my network and the guest NW. If we don't have a solution for this question, can i set my AE to use the IP TV and how??? I'm using a 4th Airport extreme

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  • HT4061 I am living in Pakistan, Lahore. I have purchased an Apple Iphone 5S online from apple store. I am facing water damage problem and there is no apple store here in Pakistan, How can I repair my phone from apple service center? Please help me

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    Take it to an authorized service center or Apple Store in the country where the phone originated.  Apple does not sell iPhones in Pakistan, nor will they ship them to Pakistan.

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    Hey korodi,
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    We are users. Apple is not here. Apple does not answer questions here. We have no idea where you are located and don't read minds.
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  • My itunes will stop working and shuts down after 5 to 10 minutes playing. I have the most recent updates. How can I repair or correct this from crashing?

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    Hello there, jbenjaminii.
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