Failure and Slow Mac OS

Hi,
excuse my english which is a little poor.
I have an Imac Intel bought in January. Some weeks ago, it starts to be slow (example: 1-2 minutes to launch safari after boot, freeze for about 5 minutes happens frequently...). On sunday, it crashes. When I boot it, the macintosh hard drive don't appear (I boot it with Alt key, launch the installation CD and the hard drive does not appear, even in disk utility tool. I tried the PRAM reset too).
One hour later, it boot normally but still slow. Do you think that a complete reinstall can solve the problem or it is a hardware problem?
Thanks for help,
Sincerly
Message was edited by: Merouman

Before you do a reinstall, try the following. Each item is something to try separately; they are not steps in one procedure.
Run Disk Utility and use +Repair Disk Permissions+. If you get warnings, you do not need to worry. It will fix any permissions that are not set properly. Restart.
Restart from your Mac OS X installation disc (insert disc and restart with the C key held down). When you get to the Installer screen (after you select language), go up to the menu bar. Under Utilities, select to run Disk Utility. This time, use +Repair Disk+. Note if any disk data errors are reported. If any errors are reported, note if they are repaired or not. If there are no errors or errors are repaired, quit Disk Utility and restart normally.
Reset PRAM following this procedure. PRAM is where some key system settings are stored.
http://support.apple.com/kb/HT1379
If those actions do not help, as a test, create a new admin user account.
http://docs.info.apple.com/article.html?path=Mac/10.5/en/8235.html
Log out and log in to the new account. Your iMac will be running with new default user preferences. In the new account, to you observe the same problems, or is everything running properly?
Please report back with the outcome of these actions. There may be more things you can try, before resorting to an OS reinstall, if your problem is not resolved.
Do you think that a complete reinstall can solve the problem or it is a hardware problem?
It is difficult to guess, unless you have done some more trouble-shooting. However, if it is NOT a hardware problem, erasing and reinstalling the OS should resolve the problem.

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Start with visits to:     OS X Maintenance - MacAttorney;
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Repair the Hard Drive - Lion/Mountain Lion/Mavericks
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the Utilites Menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD disk icon and click on the arrow button below.
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An excellent link to read is Tom Reed's Mac Malware Guide.
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Failure and Slow Mac OS

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