HP invent blue screen freeze.No boot!!

[Praveen6]

Hello everyone! First of all sorry for my bad English.
I have HP Compaq 6005 pro MT PC
Its specifications are:
Windows 7 64 bit OS
AMD phenom II X2 B57 processor
6 GB RAM
320W PSU
At the end of the last year,I upgraded my GPU from gt 610 to Zotac GTX 750 ti 2gb version.At the beginning everything was fine. graphics card worked great.After 2-3 months,one day night I normally turned off my PC.And the next day when I tried to boot my PC it was freezed at HP invent blue screen.I tried to access bios,but keyboard didn't work.When I press buttons quickly when the blue screen comes up,a black screen appears with showing Boot menu or Setup(what I pressed) at the right bottom of the screen and nothing happen.I receive no beep codes.
So I took the help of a computer specialist nearby me because i dont know much about computers .He told me that he resetted bios but didn't work.Updated Bios with no luck.
Later booted PC without GPU.
PC booted fine without graphics card.
But when GPU inserted,PC stucks at HP blue screen.and GPU's fan also spins.
He tested GPU on other system.GPU also worked fine on that system.
But my PC won't boot with that card.
So I really need help...

Thank you..

 

[kookie3010]

try using your old card back onto the system and see how it goes.right now the culprit might be your psu.

 

[Praveen6]

Thank you for the fast reply.
Yes my old GPU gt 610 works.and PC boots fine.
My system has proprietary PSU.it can't be replaced.if the problem is with my PSU ,then I can't do nothing to make that GPU back to work right?

 

[kookie3010]

Thank you for the fast reply.
Yes my old GPU gt 610 works.and PC boots fine.
My system has proprietary PSU.it can't be replaced.if the problem is with my PSU ,then I can't do nothing to make that GPU back to work right?

i see.what the model of the mobo?u can probably move it to another case and perhaps fit a new psu.it a small form factor pc i presume?

 

[Praveen6]

It is a Microtower PC.and CPU-Z showing its
Model:3047h
I checked system information it shows:
Model:HP Compaq 6005 Pro MT PC

 

[kookie3010]

It is a Microtower PC.and CPU-Z showing its
Model:3047h
I checked system information it shows:
Model:HP Compaq 6005 Pro MT PC

i believe u can move it to a BTX case and get a new psu there.or if u are a little ghetto XD,u can try getting a new standard psu and running it with the case open to see if the old psu is actually the culprit