New GPU, Now PC won't start

[ED0118]

I recently acquired an old Dell XPS 400 from a friend and decided to upgrade it a bit. First I swapped HDD's and put windows 7 on it, then I purchased a new MSI Radeon R7 250 OC edition and 4GB of ram, the max it can hold. When I got the new card I installed all the new drivers and software before installing the new card because there is no onboard video port. After I installed the drivers I put the card in, it then clicked three times and rebooted then repeated the process until I forced it off. During its off on process an amber led flashed on the Ethernet port and it displayed an error code of 1 and 4, from what I understand the numbers are similar to beep codes. I checked the power supply and I didn't meet the requirements for the card so I swapped it for an older 500w power supply I had hoping it would solve the problem, it didn't. I then looked up the code it was displaying and found that it apparently isn't a code or at least wasn't listed in the manual. Unfortunately I don't know what else to do the GPU should be compatible with it. Hopefully someone will be able to help me, Thanks.

 

My system specs are here, http://www.dell.com/support/home/us/en/19/product-support/servicetag/597Z891/configuration

 

PS, I also tried swapping the processor to a 3.0 Ghz Pentium 4 with hyper threading with no luck either, I have since switched back to the old one.

[79wjd]

What specific PSU do you have? 

What happens if you put the old GPU back in? 

 

P.s. you do know that your CPU is a major bottleneck, right? 

[Jacktastic-Mofo]

A lot of OEM PC's don't support certain GPU's.

[ED0118]

Now its an Ultra model number Win-500ps and it fine with the old GPU in

[79wjd]

1 minute ago, ED0118 said:

Now its an Ultra model number Win-500ps and it fine with the old GPU in

That also happens to be a POS psu. You've tried it again with the old GPU, or you're just saying that it worked fine with the old GPU? 

[ED0118]

I have tried it with the old gpu and it worked

[ED0118]

The psu is old and all I had laying around, got rid of my other ones like an idiot, it used to be in an old server I used as a home pc.