Dell studio 1535 is not booting up.

Hardware failure, most likely in the motherboard. Take the laptop to a repair shop for an in-depth testing. Beware, the repair will be expensive.

it seems u have got into a hardware failure or physical ram prob

Most likely resolve will be to replace the center control cover
http://support.dell.com/support/edocs/systems/1535/en/SM/cntrcont.htm#wp1180201
Studio 15 is a bit generic in description, but the chassis are genereally the same. you can get the exact model for support.dell.com, warranty lookup with your service tag.
For the 1535 you can get a new center control cover here
http://cgi.ebay.com/NEW-Studio-1535-1536-Center-Control-Cover-LOT-5-M950N_W0QQitemZ220554618993QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item335a146871#ht_500wt_956

Hi Friend,

You dell 1535 is creating problem in mother board. may be your RAM and mother board creating some problem. so you need to contact any hardware Eng. ...

it is the mother board issue

try to boot in safe mode first. turn on computer then keep tapping on F8 then boot to safe mode. once you booted in safe mode try to open notepad and word check if all keys working. if yes then try system restore it might be some conflict when in normal mode. if keys same problem in safe mode then try last known good configuration if still having the same problem with normal mode then try booting to F8 safe mode with networking. download the latest toucpad drivers and the latest bios for your system. install all downloaded updates then boot back to normal mode after. check if still the same problem. if yes then try to do system restore to the previous state when laptop keys was working fine. if all fails try to re-install the OS. if fails then have your touchpad, keyboard and palmrest replaced. (Note: when troubleshooting make sure you are using an external mouse and keyboard thru USB)

I think this a motherboard or may be a controller problem. Try contacting dell support.

Contact Dell please. You need to have Dell send a service technician to your home/business to replace the hinge cover, this is a fairly general problem, there are issues with the wireing.