Unclear of your statement. (More like run-on sentence)
Problem heading statement reads,
"trouble with install second video card HD5450 TO eMachines T6532"
The eMachines T6532 Desktop PC uses an MSI MS-7207 motherboard.
Also known as the MSI K8NGM2-L,http://www.msi.com/product/mb/K8NGM2-FID--IL--L.html
(Click on photo for a better image)
Has one long white PCI Express x16 slot. (Expansion Slot)
Only uses one graphics card at a time, will Not use two.
[Graphics card / Video card. Same/same]
Therefore I surmise you are not referring to adding a Second graphics card, but are referring to;
A) This is the second time you have added a graphics card.
B) This is the second ATI Radeon HD5450 graphics card.
Had one before. Removed it, and are using a new one.
C) This is the second time you have added a graphics card.
It is not an ATI Radeon HD5450 like the old one is.
1) You can ONLY use the OnBoard (Integrated) graphics,
OR the graphics card.
You CANNOT use both.
When using a graphics card the monitor is plugged into it.
You cannot plug into the onboard graphics of the motherboard, with it installed in the computer.
With the graphics card physically installed in the computer, you cannot just unplug the monitor from the graphics card; and plug it into the OnBoard graphics of the motherboard.
[Also; Computer on, you CANNOT unplug a monitor, and plug it back in.
This = NO ]
2) Driver: Small piece of software that allows the Operating System to communicate with a device.
The device is the graphics card.
The version of Windows operating system was not stated.
Did you install the software from the Installation Disk? (CD/DVD)
Has the drivers on it, and the user interface software.
User interface software for an ATI graphics card, is Catalyst Control Center.
(Just to note; I'm using a Powercolor Radeon HD5450 graphics card, right now.
I'm using dual monitors.
HP 2009M - 20 inch widescreen LCD monitor, and an RCA L26HD31 HDTV as the main monitor. (26 inch HDTV)
They work GREAT! ]
(It is an ATI Radeon HD5450 graphics card just like yours, IF yours has 1GB of graphics memory.
Doesn't matter what graphics card manufacturer, makes that HD5450, it is still an ATI (AMD) design.
Powercolor, VisionTek, Sapphire, Diamond Multimedia, Mickey Mouse, or Goofy. It is still an ATI graphics card )
The ATI Radeon HD5450 graphics card, has to have a MINIMUM power requirement of 350 Watts.
Does your power supply have 350 Watts or more?
If it is the original power supply, the answer is NO.
Back then power supply manufacturers were 'fudging' the true maximum rated wattage.
Sold more power supplies.
Power supply rated at 250 Watts?
More like 60 to 70 percent of that.
Divide 250 by 10.
Take that times 6. = 150 Watts (60 percent)
Times 7 = 175 Watts (70 percent)
Would like your opening statements clarified.
Post back in a Comment.