My computer has started to lock up Iam fairly sure it is a hardware problem as the longer it is on it seems to happen more often. I have changed the graphics card. Have two 256m meory strips have changed them over but still the same. I use windowsxp, motherboard is gigabyte GA-7VA I purchased this from E-BAY not to long ago seemed ok at first but beginning to suspect it. Have heard that updating bios may help is this complicated and likely to help.