Computer freezes often.

I built my first gaming computer last year and it has worked great up until recently. I have been running Windows 7 on it now for about 2 months and one day it crashed hard. It froze when it tried to boot up so i tried to reinstall 7...then xp...then 7 again after formatting my hard drive several times. I left it alone for 4 days and tried 7 one last time. It finally went through the whole installation process without stalling. However when it starts up it freezes shortly thereafter. Maybe a power supply problem?

Computer Specs:
Operating System: Windows 7 Home Professional 64-bit
CPU: AMD Phentom II x3 720
Motherboard: Asus M4A77TD PRO Motherboard
Graphics: Sapphire Radeon 4870
Memory: 2x 2gb OCZ DDR3 PC3-8500
Harddrives: Hitachi 1tb
Western Digital 500gb (used to be a external but long story short its now in my computer)
Power Supply: rosewill 500w atx12v v2.3
 
I would start by scanning the hard drive for bad sectors or other issues. Check the ram next.
 
Diagnostic software and utilities from the manufacturer of your Hitachi hard drive
http://www.hitachigst.com/support/downloads/
Diagnostic software and utilities from the manufacturer of your Western Digital hard drive
For PATA: http://support.wdc.com/product/download.asp?groupid=502&sid=30&lang=en
For SATA: http://support.wdc.com/product/download.asp?groupid=606&lang=en

For Memtest, please follow this guide...
Please note that (unless you start getting errors reported) you will need to let this run a long time.
A good way of doing this is to let it run over night. In each 'pass" there are a series of eight memory tests that are run, each more complicated than the previous. We used to recommend only a minimum of 7 passes, unless you start getting errors. We now recommend at least 10 full passes. If you have errors reported, you may want to re-run the test with only one stick of ram installed, checked each stick until you isolate those that are faulty. That way you can limit your replacement to those that actually need it. On the other hand, some prefer to install "matched" memory sticks. In this case, if you get any errors, simply replace memory, making sure that your new memory is on the HCL of the MB. Note that ASUS has tended to be very finicky/picky about memory. (I had difficulty, but I was able to open their pdf on memory modules tested to work with your board. See here: http://www.asus.com/product.aspx?P_ID=0AvsBb7WBZe2i9zK)
 
Rosewill Power Supplies are not very good. You got over a year of use. Swap it out, and remember to check that hard drive. Failing power supplies can damage hard drives. Most of these drives can be saved
 
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