loader gx black screen rev21 update(4.2u)

after installing cios rev 21 i got black screen when loading some games i am new at this and trying to figuare how it works.my neo gamma plays games fine but usb loader gets black screen when the game is selected .here is my system check iso 36,70, 249 , 250, do not have usb 2.0 like others not sure why and if thats the prob how to fix it




sysCheck GX v1.0.0 by Erik Spyder
sysCheck GX is running under IOS58 (rev 6175).
Console ID: 118957896.
Region: NTSC-U.
Hollywood v0x11.
Boot2 v4.
System Menu v481 (4.2U).
BC v6.
MIOS v10.

Found 86 titles.
Found 29 IOS and 9 IOS Stubs on this console.

IOS 4 (rev 65280): Stub
IOS 9 (rev 778)
IOS 10 (rev 768): Stub
IOS 11 (rev 256): Stub
IOS 12 (rev 269)
IOS 13 (rev 273)
IOS 14 (rev 520)
IOS 15 (rev 523)
IOS 16 (rev 512): Stub
IOS 17 (rev 775)
IOS 20 (rev 256): Stub
IOS 21 (rev 782)
IOS 22 (rev 1037)
IOS 28 (rev 1550)
IOS 30 (rev 2816): Stub
IOS 31 (rev 3349)
IOS 33 (rev 3091)
IOS 34 (rev 3348)
IOS 35 (rev 3349)
IOS 36 (rev 3351): Trucha Bug, ES_Identify, NAND Access
IOS 37 (rev 3869)
IOS 38 (rev 3867)
IOS 50 (rev 5120): Stub
IOS 51 (rev 4864): Stub
IOS 53 (rev 5406)
IOS 55 (rev 5406)
IOS 56 (rev 5405)
IOS 57 (rev 5661)
IOS 58 (rev 6175): USB 2.0
IOS 60 (rev 6400): Stub
IOS 61 (rev 5405)
IOS 70 (rev 6687): Trucha Bug, ES_Identify, NAND Access
IOS202 (rev 4): Trucha Bug, ES_Identify, NAND Access, USB 2.0
IOS222 (rev 4): Trucha Bug, ES_Identify, NAND Access, USB 2.0
IOS223 (rev 4): Trucha Bug, ES_Identify, NAND Access, USB 2.0
IOS249 (rev 21): Trucha Bug, ES_Identify, NAND Access
IOS250 (rev 21): Trucha Bug, ES_Identify, NAND Access
IOS254 (rev 65281)
Report generated on 2011-01-20.

thank u in adavance i know this is a simple fix for the the smart people out there

Not sure if this helps but I have updated to but haven't tried all the games I have. But gx might not except it compltely but rev 20 works great you might even want to try the new released usbloader gx 2.0.
But one of the moderators might know more about this also might trying to redownload v21 and reinstall could be corrupted download have trouble with that few month ago with other things.

Did you maybe change the bases when you updated? What bases did you use? I use 56 as a base for 249 and it works for most everything give or take a few titles.

I'm assuming you're using USB Loader GX! If so,then only the latest revision of GX
supports rev 21! You will have to reinstall rev 17, or upgrade to USB Loader GX 2.0.
Get GX 2.0 HERE!