Even from 2008 solutions have solved a problem!
Good thing you are intelligent enough, to know the Power Supply is the problem, out of those old solutions, Christine.
Warranty? I'm almost willing to bet sitting here in this computer chair, that the Power Supply you installed, or had installed, is a low quality unit.
Not directed towards you, or whoever purchased it. We all like to save money.
I would get my money back, and look into purchasing a more reliable Power Supply, IMHO.
If this is a Compaq Presario SR5505f Desktop PC, as the problem title states, it uses an ATX form factor Power Supply, and is rated at a maximum Wattage of 250 Watts.
The ATX form factor is used in a LOT of desktop computers.
Plenty, and readily available,http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1389575&CatId=1078
These babies are RE-LI-A-BLE.
What's that? 430 Watts?
Yes. You should have at least 10 percent more power, than the computer needs. I know. A lot more than 10 percent.
Fact: A computer only uses the power it needs, and NO more.
If the computer for example, needed 100 Watts to surf the internet, it only uses 100 Watts.
Gaming? Using an intensive game program? Yes. Then you could use
UP TO the maximum.
If you replaced the Power Supply with a 250 Watt unit, as logic of course would dictate, it is no wonder it has gone on to the, 'Great Power Supply in the sky'.
Those units are cheap. Cheap as in low quality.
1) Low quality Rectifier Bridge
2) Low quality Electrolytic Capacitors
3) Low quality Power MOSFET's.
4) Light gauge wiring.
If you need guidance in replacing the unit, (If you were not the one who did), please post back in a Comment.
For additional questions please post in a Comment.