VISTA Hangs Or Stalls In First Screen

Toshiba Satellite vista home prem.sp2 32. 4GigRam 1.90bios

Ihave read all the posts in as many threads as i can find related to this issue and they seem to identify the utility chkdsk problems of some sort. I think my problem is not related to that and happens during the initial splash screen with the Toshiba/AMD on it with the solid bar that used to speed across the screen that now hangs, stalls or whatever at a point beyond half way. It can stay there for minutes and I dont know why. I have checked all the logs,events and the like and find no issues the diagnostics from toshiba and micro both come out fine. i use the couple of aftermarket utilities as well to find no problem but it does take loads of time. If it did it all the time I would wonder but this will zip across and move on to the next screen with the moving lights microsoft screen some times. It used to be the other way round; stall infrequently. I dont know what would be a worthwhile use of time to fix this if it needs to be fixed. It will take maybe 2 or 3 re boots to get all the icons to line up in the tray as well after one of these protracted boot up experiences. I dont know what to eliminate or bring back to the start up lineup. If I go the safe mode, it , of course, loads up like a jet. Something is going on there but I dont know what it is and would like any information someone with more experience and wisdom than I have can provide. and a fix if need be.