I never switch off my tx2500ea - just put it in standby. So, the other day, opened the lid and - nothing. Just flashing lights. To cut a long story short, it turns out the bottom memory slot had gone dead. I had 2 x 2gb memory. If I go down to 1 x 2gb memory in the top slot it works, but I am then limited to the memory.... Of course, the warrenty expired last November. Phoned HP, but they didn't want to know. Phoned Which Legal (in the UK) and I may have a case. BUT.... I work for HP and I don't really feel comfortable suing them. Now what?