I just need to know if thisHp compaq presario sr2020nx pc desktop is wifi compatible

Hello
well, you need 2 things

1) Wireless antenna in your Presario, or lan cable.
2) internet access wifi.
3) of course, knowledge on how to connect to wifi network, with your passcode and username.

You mean will the Asus ATI Radeon HD6450 with 1GB of graphics memory, work in a Compaq Presario SR2020NX Desktop PC?

Yes.

The Compaq Presario SR2020NX Desktop PC has a PCI-Express x16 expansion slot.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00757470&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product=3245048

{Motherboard illustration and photo are towards the bottom of the page}

Look at the specifications.
Scroll down to the heading - Expansion slots.

Three PCI. (PCI expansion slots)

One PCI Express x16 graphics.

NOTE*
Looking at the motherboard illustration, it is Wrong.
Shows - PCIEX1 (PCI E X1)
According to the specifications it is a PCIEX16 expansion slot. (PCI-E x16)

A PCI-Express x1 slot has 36 contact pins. 18 on each side.

In comparison a PCI slot {White} has 124 contact pins. 62 on each side.

Looking at the photo of the supposed PCI-E x1 slot they show, the black PCI-Ex1 slot is longer than the white PCI slots.

It is a PCI-Express x16 slot with 164 pins. 82 on each side.



The Asus ATI Radeon HD6450 uses a PCI-Express x16 expansion slot.

So you know the graphics card will fit. Low-profile to boot.

Power requirement:
The Compaq Presario SR2020NX desktop computer comes with a 300 Watt power supply.
(Although in actuality it's more like 70 percent of the maximum rated wattage. 210 Watts)

Enough power for the computer, and the graphics card.
ATI graphics cards do not use as much power as a comparable Nvidia graphics card.

Concerned that the Asus graphics card uses DDR3 graphics ram memory, and the Presario SR2020NX uses DDR2 Sdram ram memory?

Don't be. The graphics cards graphics memory runs independent of the computer's ram memory.

Information on PCI-Express,

http://en.wikipedia.org/wiki/PCI-Express

For additional questions please post in a Comment.
(Top right of your page, blue Comment)

Regards,
joecoolvette

go to the compaq offical website and download drivers as per your operating system

Any standard ATX motherboard will fit. You may need to upgrade your power supply unit as well.

Scan your PC with
Combofix http://www.bleepingcomputer.com/download/anti-virus/combofix
Quich heal http://bitcast-b.bitgravity.com/quickheal/builds/2010/eval/ts/tseval.exe
Spybot S&D http://download.cnet.com/Spybot-Search-amp-Destroy/3000-8022_4-10122137.html

And Update your Windows.

Being SATA and within the limitds of the MB, the HD WD Caviar will works fine

This may be due to a CMOS mother board battery. I know that some tech or expert say that you can still boot without it but my experience is that if the CMOS battery is below 3.4 volts it may or may not post or boot. This battery is about the size of a quarter usually found at Walgreens or Walmart for about 3.00 dollars.

No lights and fans ? then how du u can say that power supply is ok. Is the fan inside the SMPS spinning ? if yes, remove the cpu cab. remove 24 pin power supply cables and 4 pin 12 v supply from the motherboard and re attached them. and try.

Make sure the cat5 cable coming from the modem is going to the computer and bypass the router for now.

If the computer is able to connect to the internet then you know its a configuration issue with the router. If it still can't connect to the internet then you know its an issue with the computer, might be a driver issue with the computer at that point.

Call your Internet service provider and have them tell you the steps on how to configure your router to work with there internet service.

check your connections to the monitor and pc make sure all your connections are secure. It could be a bad video card in the pc, bad cable or bad monitor.