mac problems

[mikeyz6]

first problem i had. somewhat solved.. i was trying to load windows 7 onto the computer (still never did) but was able to load the OS up

now my comp froze.. apparently i was loading too much stuff up.. and now its going ot the startup white screen.. chimes... then to a black screen with a blinking _

 

[simsaladimbamba]

Beware, lots of C&P will follow, but first restart the Mac and immediately after the startup chime sounds, hold down the OPTION/ALT key and select the Macintosh HD you have Mac OS X installed onto.

"How to maximise your MacRumors troubleshooting experience" created by mad jew in 2006​

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Have you also taken a look at MRoogle, since that question may have been asked several times?

And in regards to your wording (uploading too much stuff, whatever that means):
Helpful Information for Any Mac User by GGJstudios