After installing ATI 5770 my computer makes 3 popping at start. My comp pops then my dvd drive starts to spin then second pop,drive starts to spin then third pop then drive( the pop or click is coming from the little speaker in the computer) starts to spin then computer starts as normal...Also, just like the model 4650 I just installed prior to the 5770,right after start my usb keyboard and
usb mouse did not work.I had to connect them with older adapters.(non usb)
Note: after the initial symtoms I described above the computer works and sounds normal for hours of use!
Temp stays at 45 celcius...
I also notice something else at startup,the fan surges for a split after I hit power on, then normal! 
Motherboard: Gigabyte GA-M57SLI-S4( the board has 
Socket AM2 With Nvidia Nforce 570SLI Chipset  2.6ghz
OS Name   Microsoft Windows XP Home Edition
Version   5.1.2600 Service Pack 3 Build 2600
OS Manufacturer   Microsoft Corporation
System Name   DENNIS-JJQ58ET6
System Manufacturer   GBT___
System Model   NVDAACPI
System Type   X86-based PC
Processor   x86 Family 15 Model 107 Stepping 2 AuthenticAMD ~2613 Mhz
BIOS Version/Date   Award Software International, Inc. FE, 11/22/2007 (the board itself has "tpm  rev.2.0" printed on it)
SMBIOS Version   2.3
Windows Directory   C:\WINDOWS
System Directory   C:\WINDOWS\system32
Boot Device   \Device\HarddiskVolume1
Locale   United States
Hardware Abstraction Layer   Version = "5.1.2600.5512 (xpsp.080413-2111)"
User Name   DENNIS-JJQ58ET6\Owner
Time Zone   Pacific Daylight Time
Total Physical Memory   3,072.00 MB
Available Physical Memory   2.15 GB
Total Virtual Memory   2.00 GB
Available Virtual Memory   1.96 GB
Page File Space   4.34 GB
Page File   C:\pagefile.sys