HP Touchsmart 520 1010 upgrading Graphics Card

[Vendo232]

Hi

I own HP TouchSmart 520 - 1010 with MXM Graphics Card Radeon HD 6450A.

Today I tried to upgrade and replace this graphics card  with another HP card Radeon HD 7650A.

I got black screen and my PC did not boot up.

per spec for TouchSmart 520 this unit as one Mobile PCI Express Module (MXM) socket (MXM 3.0 version: Type A) (usable with a card rated less than 35 watts) and uses shared memory up to 256 MB.

The Radeon HD 7650A per spec is rated at 33W. Both cards 6450A and 7650A are MXM 3.0 type A

Is there a better card which could work?

Would BIOS update help?

Any other idea how to improve graphic performance on Touchsmart 520?

[Vendo232]

this PC has upgradable CPU with chipset 1155 up to I7 2600S

and

upgradable MXM Graphic Card up to

GeForce GT 540M 2GB

GeForce GT 630M 2GB

Radeon HD 6550A 2GB

Radeon HD 7650A 2GB

I was able to update BIOS to the latest version 7.11 and will try again 7650A

[Vendo232]

I learned that HP has been offering 2 types of Radeon HD 7650A. Do you guys know what might be the difference?

The one I have is Panther 2 and the TS 520 should be qualified for Panther 1

671864-001

V268-01S

GFX Panther1

671864-002

602-V268-02S

602-V268-06S

GFX Panther2