I have the opposite to a black screen problem with my minolta 5d

if the battery is fully charged it could be that you switched off by error the display....
to turn on again see here:
Konica Minolta MAXXUM 5D Instruction Manual Display Button

two reasons for this are possible:
1) you changed the exposure compensation by mistake to minus something... - see below - change it again to +- zero:
Konica Minolta MAXXUM 5D Instruction Manual Exposure Compensation

2) you should have the ISO settings to auto:



Konica Minolta MAXXUM 5D Instruction Manual Camera Sensitivity iso And...

Try downloading the photos to a computer. If this doesn't work there may be a problem with the flash chip. If so, try reformatting it - that worked for me when I had a couple of photo storage locations that constantly put up garbage displays and produced file error messages on downloading.

inside of the camera are some parts, that can be broken or loose see the diagram, and proceed with common sense. God bless you

contacts of the card reader,card clean asjust the contacts.

Press the MENU button, select "Drive Mode," then select the self-timer (one-handed clock). To start the self-timer, press the shutter release button.

The P-channel MOSFET switching the CF power is dead. It is on the little board directly above the battery compartment. SOT23 package, the marking is 338 or something like that. Replace it and it will work.

There is a known problem with the 7D and some early 5D's where sometimes when you turn the camera on and take a picture it is all black and the camera locks up. You can turn it off and back on and the problem goes away for awhile. Don't know if this is what ou are experiencing. If it is, Sony (who bought out Konica Minolta's camera division) will fix the problem for free. Just had this repaired on my 7D.

It sounds like that's the first black frame problem that is a fairly common defect with the cameras, so much so that Sony is repairing it for free, for more info, see:

http://ca.konicaminolta.com/information/20070202/01_en.html

then go to:

http://eservice.sony.com/webrma/web/index.do to set up for service.

Shooting in the dark here, but the basic things you should try before all else is another mem card, and new compatible batteries. sounds more like a card problem though. hope it works out